EDIT: This did not work consistently, and I ended up chucking out all the cheap Aliexpress Mice I had purchased. I have given up on cheap Bluetooth Mice for now. I believe good quality ones exist, but I haven't found them yet. I will leave this up as a guide for others who may wish to exhaust all options before following in my footsteps...
At least, I hope they are solved finally. I'll revisit and delete or modify this post if it's just been a fluke.
I recently opted to purchase several mid-priced bluetooth mice from Aliexpress. After using the first one for an afternoon, the dropped connections that only seemed to be solved by switching it off and on again were really getting me frustrated. I changed out my usual AAA rechargeable batteries for brand new alkaline ones, but that didn't solve the problem.
Now I think I have figured that the issue is with the default Windows settings for bluetooth - you need to hit up the Device Manager (WIN + X) and then the bluetooth devices. Pick your adapter, either generic, or Intel, or whichever it may be, and then under power management, turn OFF the option for Windows to be able to control the power to it.
Not sure why, but Windows will shut it off even if you've only left it dormant a few seconds. Blah.
I am not blaming Microsoft, perhaps these cheap devices aren't using standard protocols or something... But at least this is a quick and easy fix.
