2018 MacBook Pro randomly losing WiFi connection

My month-old Mac has randomly started dropping my WiFi connection without any notification. One moment it's working fine, the next I'm offline. According to the WiFi dropdown in the menubar, my machine is behaving as if I had clicked to disconnect from the network; WiFi is on but not connected, all networks that should be in the list of nearby networks are there, and clicking on my network connects back up in under a second and I'm back to working again online... until it drops again anywhere from ten minutes to a few hours later.

This issue started almost immediately after installing "macOS High Sierra 10.13.6 Supplemental Update 2 for MacBook Pro (2018)" from the Mac App Store and is affecting me on any WiFi network I connect to now if I'm connected long enough. It's usually just a minor inconvenience, but if it went down at just the wrong time it could cause serious issues with what I use it for. My 2011 MacBook Pro, also running macOS 10.13.6 but without the update specific to the 2018 model, doesn't have this issue... nor does any other device in the house, including a 2014 MacBook Pro, two 2007 MacBooks, and a 2009 iMac which are also all on the latest versions of macOS that they support. (Same for all the iPhones, iPads, and Apple TVs in the home) It looks like this bug is reserved for those with the latest and greatest portable Macs, so I'm out of luck until a fix comes around.


Does anyone have any ideas as to what may be causing this? I'm pretty sure it's an issue with the recent update; my Mac doesn't have a whole lot on it yet besides Apple apps and Adobe Creative Cloud software, and I don't browse anywhere or download anything from anywhere that could have given me anything unpleasant on my system. I basically treat this thing like a baby, so there seriously shouldn't be any issues with it already. My MacBook Pro and AirPort Extreme are both on the latest software version they have available, and I've troubleshooted both devices.

MacBook Pro (15-inch, 2018), macOS High Sierra (10.13.6), TimBook Pro

Posted on Sep 10, 2018 10:37 PM

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Posted on Apr 11, 2019 2:26 PM

So, after more analysis I found this issue only repeatable when I had ANYTHING plugged into USB-C


This hard to find article explains the problem. https://support.apple.com/en-au/HT201163

If your USB device has a cable long enough that you can move the device, place it away from your Mac—and make sure not to place it behind your Mac, or near the hinge of its display. The antennas for Wi-Fi and Bluetooth are located there, and USB 3 devices placed there might interfere with your wireless connections.


Some Genius decided to put the USB-C ports right next to the WiFi antenna. The noise for a in proximity USB-C device can cause the issues reports. Sounds like a significant design flaw IMHO. Fixed by using a non-apple USBC hub with a longer cable than the apple designed USBC dongle. Also have USBC extension cables on order.

239 replies

Feb 18, 2019 9:00 AM in response to Delta5

What version are you running on the NanoHD?


How far is your MacBook Pro from the NanoHD? Are they in the same room?


Have you paid attention to the Tx rate on the MacBook Pro when it’s on battery power and especially after being on battery power for 30-40 minutes while associates with the NanoHD? My TX rate starts degrading and gets as low as 13 Mbps.


What problems were you having on the MacBook Pro with the Synology router?


Thank you.

Feb 18, 2019 9:46 AM in response to sirozha

NanoHD firmware is 4.0.21.9965. Just the default latest from the 'check firmware' on the controller.


For a few days the Nano just sat on a desk in the room with my WAN access, exactly where the RT2600ac sat and TC still sits. That's about 25' away but through three interior drywall walls. ~867-975 w/ blips to 1170. TC is usually 650-867 from the same spot. RT was 867 with blips to 975 when it worked - see other thread below. Since with the flexibility of having an AP away from router/switch, I've put the Nano in a more central location, now sitting on a bookshelf in the same room about 10' away from my MBP. Solid 1300mbps, two, 5-second blips to 1170 in the past hour.


That TX rate issue you describe is what I experienced with the RT2600ac. Though for me it didn't matter whether battery or AC, sleep-resume or fresh boot. I haven't done a ton of sleep/wakeup tests on the Nano, but I spent most of yesterday working on battery. That would involve an hour or two of work, close lid for a break, come back 15 minutes later, etc. I didn't notice any speed problems. On battery while I type this, solid 1300mbps unless I lean a certain way and block LOS with the Nano, then it drops to 1170.


The only 'custom' thing I did on the Nano was widen the channel width to 80. 5Ghz spectrum reports very clear, 4% utilized. 2.4Ghz spectrum is busy, ~40% utilized.


See this thread for details with my Synology RT2600ac problems. 2018 15" MBP + Synology rt2600AC = super-slow 802.11ac. 13Mpbs, MCS=0

Feb 20, 2019 1:07 PM in response to sirozha

Do you experience the Wi-Fi issues described in my post? Wifi stops to goes so slow


What type of Mac (model and year) do you have? 2018 MacBook Pro Mojave 10.14.2


What router/AP do you use? Need to check, all other items have no problems connecting Samsung tablet and phone. Same issue with another WiFi setup.


Do you wear an Apple Watch? No


Is there a person in the vicinity with an Apple Watch? NO


Feb 21, 2019 1:10 PM in response to sirozha

@sirozha: Well, I guess it's the auto-unlock. If I remember correctly I activated it a few days after setting up the new MacBook Pro and had no issues the first days. The next thing is that we don't know for sure if AirPlay works the same way on the old ATV3 as it does on the ATV4 and ATV4 4K. ATV3 doesn't have the nearby function, neither does it have tvOS.


Edit: I'll reactivate AirPlay on my ATV3 tomorrow afternoon and check if it makes a difference.

Feb 21, 2019 1:28 PM in response to Mac-Trek

@Mac-Trek


The article that was linked to earlier in this thread that clued us in to AWDL mentioned an "attack" by Apple TV, using AWDL. That article was posted in 2014. Apple TV4 (the first Apple TV with tvOS) came out in 2016. So, the Apple TV referred to in the article must have been an Apple TV3.


https://medium.com/@mariociabarra/wifriedx-in-depth-look-at-yosemite-wifi-and-awdl-airdrop-41a93eb22e48

May 16, 2019 6:20 PM in response to TimsTech

Same issue here. Brand new Macbook Pro (15-inch, 2018) right out of the box as of yesterday. I started having this issue almost immediately.


I tried several of the suggestions in this thread.


  • was already using 5Gz
  • only other Apple product I have, my older work laptop, has never had issues on the same wifi connection
  • I have no Apple Watch or iPhone or Apple TV
  • bluetooth is off but I do have bluetooth devices around (like a PS4 controller, for example)
  • laptop is new, so there's no saved wifi entries to delete
  • power connected on the right side away from the antenna. No other USB device connected
  • Comcast-provided router, haven't messed with it yet


The odd thing I noticed is that when the wifi icon goes gray and I select my wifi network to reconnect, it is back immediately. There's no "handshake" animation on the wifi icon as if it is connecting to a new wifi connection. If I'm talking to someone on Discord and the connection dies, and if I notice quickly and reconnect, the other person doesn't even know I was gone.

Aug 1, 2019 1:58 AM in response to ImagineFIlms

I reported similar problems on 25 June 2019 (see above).


I will add that if, in my Safari window environment, I choose 'Latest Gloucestershire news' using https://www.gloucestershirelive.co.uk/news/ I am guaranteed that the wi-fi connection will be lost and that I will have to restart my Mac.


Perhaps the technical experts can see what it is with https://www.gloucestershirelive.co.uk/news/ that collapses the wi-fi link, as opposed to other links such as UK - BBC news ( http://www.bbc.co.uk/news/news/uk ) and Yahoo Mail (http://mail.yahoo.co./d/folders/1 ) which seem to be well behaved.


John_of_Gloucester

01 August 2019





Aug 3, 2019 2:05 AM in response to BDAqua

Dear BDAqua et alia,


Thank you very much for your email posted to me on 1 August at 16:21 regarding my problem of frequent wi-fi drop outs with OS Mogave 10.14.5 .


 On my MAC, my more knowledgeable IT son took and implemented the advice you suggested, but unfortunately it didn’t solve the problem with a ‘guaranteed’ drop out occurring after shutting down ‘Latest Gloucestershire News’ (https://www.gloucestershirelive.co.uk/news/ )  when using the Safari web browser.


Still using my Mac, he then set up for me Google Chrome web browser and then successfully and repeatedly  accessed and left https://www.gloucestershirelive.co.uk/news/ 


The problem had gone!


My particular fault therefore occurs with MAC’s Safari web browser (version 12.1.1 (14607.2.6.1.1) and not in Google Chrome (version 76.0.3809.87 (64 bit)).  IT experts may want to investigate this.


Regards,


John_of_Gloucester


03 August 2019


References

1      Email, 25 June 2019 at 4:32 am


2      Email,  01 August 2019 at 1:58 am

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2018 MacBook Pro randomly losing WiFi connection

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