Thanks for the reply!
I'm also on these versions. Unfortunately resetting both apps to default settings (clearing storage) didn't solve the issue.
At one point, however, I managed to keep Spotify play sound continously: the volume was very low, but I was able to fiddle with PA EQ settings, and it was playing until I pressed pause/play. Then the usual thing started happening again. This was random, not caused by any particular setting, it happened after one of several resets to default settings and I failed to reproduce it again.
I don't know if this can be of any help, but I attached an exported log file, just in case.
pa eq log.txt