[Elecraft] K2/100 QSK problem

[k2zf50 at aol.com]

Upon initial power up OR after the K2 has been idle for a short period of time I have discovered that the first character keyed gets truncated. If I was to send my call sign - K2ZF - the K would be transmitted as  A. Letter K  dah dit dah  -  the first dah would NOT get transmitted and the receiving station would answer  A2ZF. Its no problem if I was to call CQ and repeat my call sign a few times, but if I'm chasing DX and I send my call only once the DX would reply  A2ZF.
Every other letter gets transmitted properly afterward, its just the first character after the K2 has been idle. Should I be looking for a sticky relay and if so which one?
Thanks,  Jim  K2ZF