2017 27" iMac 5k bluetooth issues

I haven't heard any more info but am going to organise a repair soon...if there is any new info I will update here.

I too am having the same problem. It usually manifests itself when I plug in a usb drive. The only difference is that I have a 2015 Retina 5K 27" iMac.

Did anyone buy external Bluetooth USB adapter and tries to switch off the internal BT connector solving the issue?

To clean cache you can use: https://www.google.com/amp/s/www.chriswrites.com/cleaning-up-cache-log-files-and-temporary-files-in-os-x/amp/

Tried it but problem remains.

I have the same issues, have tried everything discussed. It seemed to start after the last big update

I definitely think this is a USB problem because many times when I plug something into a USB port or the OS tries to access a device that was plugged in earlier, I lose both the keyboard and the mouse. Sometimes they come back but other times I get Bluetooth Not Available and I have to reboot. The obvious test is to disconnect all your USB devices and reboot. Make sure bluetooth is up and running and stable and then start plugging devices back in one at a time with a reasonable time gap and try and use that device and see what happens. I just plugged in my iphone no problem and iTunes backed it up before installing the latest version of IOS, and at the point of the install where iTunes reboots the iphone I lost bluetooth again. I have also had the problem when accessing a Samsung camera via USB. If the USB ports are empty I do not get the problem. Obviously thats a pain in the *** and isn't a viable solution but at least Apple might try and figure out what the connection is between bluetooth and USB ports because I'm ****** if I can. The workaround is to download some software onto your phone (either android or IOS) that connects wirelessly and use that when bluetooth fails Not a great solution but better than nothing. I am using an app called Mobile Mouse. Good Luck

Well for the last 3 days (after removing Android File Transfer), I have been able to put my iMac to sleep and the bluetooth devices (keyboard and trackpad) have not disconnected.

So why is this?

Perhaps there is something running in the background that is interfering with the bluetooth, my guess now is that it was Android File Transfer which I had on my iMac for a month or more (about the time the bluetooth starting playing up.)

I also think there still may be an issue with usb 3 cables but mine are moved away from where the bluetooth adapter is situated, Apple suggests placing usb 3 cables in the ports closest to the centre of the iMac.

I will give this setup a few more days before I try connecting a usb 3 drive to see what happens.

This is not to say that the recent software update hasn't contributed to the issue too.

Thank you so much everyone - Android File Transfer is also the issue on mine. Oculus Quest runs on Android and the file transfer is needed to install apps or copy movies. Disabled in "login items" and back to normal. Thanks again!

-Stephan

I am beta testing MacOs Catalina and the good news is this problem (Android File Transfer app causes some Bluetooth devices to hang and in some cases to hang Bluetooth to the point that the only fix is to re-boot your Mac) goes away after Catalina is installed

Did you try http://www.geekguides.co.uk/414/how-to-select-a-bluetooth-adapter-in-os-x/ in order to select proper bt?

But what to do? if no one find how to solve the issue? Because I think if apple dent have a solution to this, apple should go public and all about this vulnerability