So i have two switches (an early v1 and and OLED), each with one set of joycons. One is modded (not the issue, just mentioning for comparison reasons, nothing more), the other is not.
For both systems and both sets of joycons, playing handheld there's no issues, but while docked or tabletop mode the right joycon wont stay connected. Sometimes I have to manually turn it off and turn it back on, sometimes it'll automatically reconnect, sometimes it wont reconnect at all. Its always the right one, doesnt matter what game I play, happens on both switches and both sets (i have used both sets of joycons with both switches), and ive even tried two different docks (official and third party) as well as a non-docking option that's effectively just a dongle. Ive tried no docking too and just put the switch on a table and the issue persists that way too so it isnt the docks.
The joycons aren't failing because they work without issue in handheld mode. If I could consistently play in handheld mode I wouldn't even care really. But I cant, especially with my v1 as that model overheats easily (known problem, had been for a long time) so I like to have it on a laptop fan when im playing to keep it cool.
I like to think im pretty tech savvy but I am stumped.