[Elecraft] Problem with 17m band in K2 + KAT100/KPA100 in EC2

[Marcin SQ2AF]

Hi all,

In last Friday I have been finished KAT100/KPA100 in EC2.
Few days ago one problem occurred - before TX on 17m RX is OK, after TX on
this band RX dropping down. This is only on HI power range, on LOW
power range everything is OK.
When I change band to other then 17m and then come back to 17m RX stay
OK to the TX and then drop down again. When I Off then On K2 or push
TUNE key, RX come back to normal.
Is anyone know what is the problem?

73,
Marcin SQ2AF

K2 #5408