[Elecraft] Weird K2 tuning thing (hand capacitance)

[TJ Campie]

Something seems weird with my K2 - when I put my hand near the front left of the face the frequency of signals on the band swing around wildly (sometimes I can get the signal to go outside of a 500 hz passband). Sometimes it settles back down to where it was before but sometimes not. It also happens if I push on the top of the cover on the top left too. I'm not sure if its a shielding issue or what but I took the cover off and stuck my hand in that corner and could not get it to act up until I put the cover back on. 
I couldn't find anything in the manual about this type of behavior so hopefully somebody on the list knows of a way to fix this as it is getting a bit annoying. 
Thanks! 73 de W0EA
TJ