I've got multiple audio outputs on my pc and I disabled the option to automatically set piplay as default audio.
After every restart default audio output gets automatically reset to a different one, the one that Piplay has decided to be my "default".
For ex. I set output to headphones and after restart it resets to monitor speakers, I set it to pimax and after restart it resets to monitor speakers again.
Every piplay reinstall changes the "default" audio device it defaults to after restart, so maybe next reinstall it always reset to headphones.
I can't confirm from which piplay has this been happening, but it's been like this all the latest versions.
PC has been formatted and having piplay installed reproduces the same behaviour.
Uninstalling piplay resolves the problem.
Since version 2.x.x Piplay switches around default sound output between devices after restart