Alesis Andromeda A6

I bought one with a similiar problem. The main screen suddenely 
changes to edit screens, not any particular one. I haven't received 
the synth yet. The first thing I plan to try to do is see which pots 
are related to the screens I jump to. Then pop the Andy open and 
clean those pots. I also found this information that may apply to the 
problem....

22.24 preventing the screen from jumping:
Mike Peake wrote:
There is a way to reduce the jumping, but only by changing the 
behaviour of the potentiometers. Try
the Pass-Through knob mode which can be accessed by pressing Global, 
then Panel, and then use
the soft pots to set it to Pass-Through: ON. This causes the pots to 
not produce a new value until
you've turned them to the physical location of the stored parameter 
value. The parameter then
becomes active for that Program. The other Pass-Through mode is for 
the soft pots when used in
selecting Mod Sources (a long list so it's a good idea). If you want 
the screen to cease jumping to
new parameter pages, press soft buttons seven and eight together. 
Press them both again to unlock
the function.