I had a problem like this when I had my old vike with pandora in it. It would randomly change setting on me. I set the dwell at 12, dropped shot mode.
Take to the field and it wold be extremely loud, eat air like non other, and the eye's were'nt in dropped shot mode...play around a bit...and it work all fine and dandy for a while...then it's back to actiing up.
Took it home, plugged it in. Dwell was at 30 and eye mode was changed to forced...
So I bought a Tadao board and all was solved