Hi and welcome!
Me and a few other people experienced something similar, though you’re the first one where a rollback to v1.61.x hasn’t helped. The thing is, 1.62.x has made the devices much more sensitive to power supply issues. Therefore I’d recommend to check that. I made a detailed post about my own case here (symptoms are described a few posts above): New Nextion Editor 1.62.1 is available - #9 by Max
Hope it helps!
Max