Definitely, do not upgrade to the new firmware. I did before I went on vacation big no, no, lost a lot of devices and by the time I got back couldn't recover the lost devices had to unpair and pair them again. I also believe going back to the old firmware is causing some network errors on my server and slowing everything down. If anything I have learned a big lesson, DON'T BE THE FIRST TO UPGRADE TO THE NEW FIRMWARE.
Good luck if you do.