i have the same problem. It started some weeks (or month?) ago. First i ignored it thinking this is a software-bug, but now i think it's getting worse time after time. Using the remote is no problem, only with the knob...
I still hope, it's software, i don't want to miss my empeg... :-(
Thomas
MK2 blue/red 12GB #815
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cheers, Thomas
new owner of the MK1 00123
MK2 12GB 090000815 (my first one)
MK2a 040103735 (from 303) and ???