Internet (Hard wired and WiFi) drops until Mac is shut down or restarted?

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Level 1

8 points

Internet (Hard wired and WiFi) drops until Mac is shut down or restarted?

2 to 3 hours after my iMac (2015 running Mojave) is turned on my internet/wifi drops until I re-start the Mac or turn it off. The modem shows no change in connection but none of the connected devices can access the internet until the mac is either shut down or restarted. Our ISP (CenturyLink) has replaced the modem twice and sent technicians to our house but their connections always look good. The mac seems to be the problem. Apple Support suggested I disconnect the Mac from the power source to reset RAM and other parameters but that did not help the problem.

Any suggestions on why this happens?

iMac 21.5", macOS 10.14

Posted on Apr 23, 2019 10:56 AM

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Answer 1

rkaufmann87

Level 10

148,440 points

Apr 23, 2019 11:09 AM in response to acm1360

Please use https://support.apple.com/en-us/HT202222 to troubleshoot your Wifi issues.

you do not reset the RAM however a NVRAM reset may be needed. Use this link for instructions https://support.apple.com/en-us/HT204063

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Answer 2

rkaufmann87

Level 10

148,440 points

Apr 23, 2019 11:27 AM in response to acm1360

The problem is likely caused by something installed on the the computer. Please visit the Mac App Store, install the free EtreCheck app and run the report. Then post the report here using the instructions in https://discussions.apple.com/docs/DOC-250000211

We can then look for obvious issues causing your problem.

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Answer 3

acm1360 Author

Level 1

8 points

Apr 23, 2019 11:21 AM in response to rkaufmann87

Thanks for the info. Unfortunately, I have re-set the RAM and NVRAM with no apparent change in the issue. 2 to 3 hours after re-start the internet/WiFi drops and is only restored after I re-start or shut down the mac.

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Answer 4

Apr 23, 2019 11:12 AM in response to acm1360

I would suggest the next time it happens, open Applications->Utilities->Activity Monitor

and select the network tab and see what is going on. If there seems to be a lot of traffic,

see on the list what is using all the bandwidth.

I would have considered a possible hardware issue but since you say it happens with

both WiFi and Ethernet, it sounds more like some app, firmware, or possible malware

issue.

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Answer 5

Internet (Hard wired and WiFi) drops until Mac is shut down or restarted?

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