Remote Midi Controller always losing contact

I thought the issue was that my Arturia Keylab 61 Essential was constantly dropping connection to Nuendo 12 and sending out weird commands from certain keys. But after going back to my Korg NanoControl 2, it also loses connection to N12. It defaults to controlling my sub groups, same as the Keylab. But both of them stop working when I minimize N12, and then come back. When I come back the faders are controlling arbitrary tracks. When I disconnect the Nanocontrol and then reconnect it all is well. But it also changes what it’s controlling even if I don’t minimize N12. Since I first wrote this post, I’ve had the faders on both the Arturia and the NanoControl change to controlling totally different things. The Keylab is not even assigned to any remote controller.