[Elecraft] K2 / 10 - Freeze Up

[Chuck]

Earlier this summer picked up a very nicely built K2
to replace the one I had built and foolishly sold. S/N
is 4715 and the build date is 2/05. Firmware is 2.04P
1.09. Installed accessories are K160RX, KAF2, KAT2,
KI02, KSB2, and KNB2. Additional modifications are the
W3FPR AF Level Output and Cliffton Laboratories Z10000
Broadband Buffer Amplifier (used with a SDR-IQ to
provice external pan-adapter). The K2 has been used in
the CW mode only.

In the last several weeks have experienced a freeze-up
almost every time used. Will have completed my side of
QSO and received without any problem the other party. 
Upon their turnover discover that I have no transmit. 


The display will generally be showing power but,
sometimes keyer speed and no amount of control
twisting or button purshing will effect any change. 
Recycling power will yield "ELE" in the display but,
otherwise the rig is totally non-functional. 

After several hours, can turn K2 back on and all is
apparently normal. 

Any ideas would be much appreciated. Have not yet
reset EEPROM to factory defaults.

72, Chuck AF4PP