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levmc

macrumors 6502a
Original poster
Jan 18, 2019
687
25
It happens so often that I always have my non bluetooth mouse and keyboard connected to the iMac.
 
"It happens so often that I always have my non bluetooth mouse and keyboard connected to the iMac"

^^^^^
This is "the answer".

Do you have any USB3 devices connected to the iMac?
USB3 seems to produce RF interference that can "get in the way" of BT.
Also, could have something to do with wifi.

BT is a "weak signal" by design.
If you can put up with non-BT keyboard and mouse, again, go with "what works".

I've always preferred a WIRED keyboard, which I use with a wireless mouse (Logitech which uses its own RF receiver, not BT).
 
I've had this problem with pretty much every iMac I have owned. My current 2019 has the same issue, it is very annoying and defeats the purpose of wireless. I have brought this up many times with support to no avail. Maybe one day they will get it figured out. I just leave them both connected all the time as I hate having to get the cords out and plug in.
 
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