so I figured out how to fix the audio of my left index speaker cutting out. Turns out the screw holding the headstrap itself was very loose, so the pogo pins inside the connection were disconnecting sometimes. However, the hole to access the T6 torx screw in there really really narrow, like 2mm in diameter or something, and my screwdriver was too fat. I thought I'd have to go buy a special thin screwdriver just for this, but it turns out the circular plastic ring also pops out if you can hook it with a paperclip, then a screwdriver will fit in fine. Tightened the strap and now the audio works great again.

In celebration, here's some Electronauts jamming:

https://streamable.com/naifp2