For at least the last few versions including the latest version I have randomly experienced distorted bass. The first time it happened I thought something was wrong with my amp. The bass seems overdriven and craps out at even low volumes. Restarting Volumio makes the sound go back to normal and it stays normal as long as I leave the Pi on, but the issue randomly reappears on subsequent power cycles.
My playback hardware :
RP3
3a linear power supply
Allo Kali Reclocker
HI Fi Berry Plus Clone