[Elecraft] K2/KPA100/KAT100 Tuning Issue

[Jon Perelstein]

I have a relatively new K2/KAT100/KPA100 (K2 serial # 06550) with the KAT100 controlled from the K2 via the serial cable.
 
Occasionally (and I do mean "occasionally" as opposed to "sometimes" or "frequently"), when I hit tune on the K2, the display on the K2 correctly shows 20 watts, but it doesn't show anything for the SWR.  In addition, I don't hear any relays switching in the KAT100 and the front-panel SWR diodes on the KAT100 remain wherever they were at the last tune I did.
 
When this happens, it appears to stay in tune mode until I hit the tune button again, at which time it comes out of tune.  If I then hit the tune button still another time, it does a proper tune and ends with a good SWR (whatever is typical for my antenna on the particular band I'm on).
 
Once, and once only, instead of displaying the power, the K2 simply displayed 'END'.  That cleared when I hit tune a second time, and when I hit tune again after that it did a good tune.
 
I have not noticed any pattern in terms of band or mode that I'm in when this happens.  I haven't noticed it happen at low power (i.e., below 11 watts), but I haven't operated the K2 at that level very much (I still have my K1 for QRP).
 
Does anybody have any idea why this is happening?  Is it a problem?  If it is a problem, what would I look at to see if it can be fixed/eliminated.
 
Thanks,
 
Jon
KB1QBZ