Not sure if this is happening for anyone else or if this is unique to me since I'm playing on Linux through Proton, but in all of my save files the spectrogram eventually glitches out so it only works for the first couple seconds of a playback. Problem persists through restarting the program.

Does anyone else have this problem? Is there any known way to fix it?

This happened to be in the regular last 8.2 update, whatever it was. It didn't really bother me much, and I didn't realize it was a bug; I thought it just failed sometimes. But it has persisted through that and to now, so I guess it is one, huh. 

nothing to do with linux, just a bug with 0.9 fairly certain they are aware of it and should be fixed soon

Jup. I can confirm as well. That the radar path definitely glitches the spectrometer out. Removing the upgrade fixed it for me. Playing on Windows.

For the people wondering: yes, the radar pathing module breaks the spectrogram (as well as pencils and whiteboard) because of engine limitation: one can't draw stuff without overriding the other

Regardless of the bug, I think the "locker signals" just don't have a spectrogram, I downloaded and played them and nothing showed on the screen, but when I downloaded a normal signal and it worked fine.

Same. Win 10,  0.9n

im on 0.9.0n windows 11, the spectrogram never works, even before then. you're not alone.