I keep having problems with the switches freeze. I uprgraded the software to the latest version 3, backed up the presets, did a CLEAR SETUP, it looked allright for few days but yesterday night I was on stage with the band and at certain point during a song I pressed  a switch in play mode to change a preset and immediatelly realized that all the three switches where frozen. So at the end of the song I disconnected the power from the back and re-connected and then it worked fine for the rest of the night. Not a nice experience because I feel now I cannot trust to this machine. What shall I do? Thanks