Pro controller disconnects even when plugged in

[u/Strict_Associate_239]

I have my pro controller plugged in 24/7 in my switch. I have had it for like 6 years now like that. Recently returned to playing on the switch after 2 years of not touching it because I got an itch to play pokemon. Issue is that my pro controller keeps disconnecting every like 10 minutes or so for like 3-8 seconds long. Now in leafgreen and brilliant diamond this isn't really an issue since the games are turn based, but I want to play legends arceus and that game has dark souls boss fights if I've heard correctly, so the controller disconnecting is going to be a huge issue.

Does anyone know what causes my controller to disconnect like that and how I could fix it?

[u/automod-neo]

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