deskthority

Very weird problem with this model M I just got.
Whenever I type Lshift+Y it sometimes gives a uppercase Y, sometimes lowercase Y. Rshift+Y always gives uppercase Y. Rshift+M sometimes gives a uppercase M, sometimes lowercase M. Lshift+M always gives uppercase M. Lshift + Rshift + Y always gives uppercase "MY". Lshift + Rshift + M always gives uppercase "MY".
All other keys and keycombinations seem to work perfect. All the keyswitch mechanisms seem to work fine. Any thoughts on what might be happening here ?
Thanks!

Could be something up with the sensing mechanism.

My recommendation would be to clean the membrane. Could be dirt related.

Thanks guys. I'll try to clean the membrane, good opportunity to bolt mod the board.