KPA500 and K3 set up does this also. I have tried to duplicate it without much success, it is somewhat random. What I think the cause is, the output power of the K3 exceeds what the KPA500 wants, even though I have set it per band, I think sometimes there is a spike in power, causing the KPA500 to fault. This is a guess on my part, since if I cut back on the power on the K3 it does not do it as much. The other thing I have noticed, it does it more on certain antennas, so it could be related to SWR. I have the KAT500 too and SWR is checked before I transmit with the KPA500. I tend to transmit on the same freqs a lot. Some days it will work flawlessly, then the next day, with nothing changed, the KPA500 will have this problem. Please advise if anyone figures this one out. Thanks Emory WM3M
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