has anyone one the list experienced sticky keys on a duo 230 keybd before? furthermore, has anybody experienced a duo 230 keybd whose keys seem to require too much pressure to depress?? could it be that my duo's keybd is just getting old... in fact the only reason i don't use this machine more often is that the keybd is painful to type on... any ideas on how to fix / replace this nasty keybd? many thanks, dylan