I have had a similar issue? on all bands with CW regardless of power and with 3 different radios driving the amp when using a direct band cable from the radio to the amp. Using normal mode on the amp works fine though. Went back and forth with Mark as well. Several firmware updates later and no change (been dealing with it for about 2 years). I'm using the HF-Auto with the amp as well. Could be something in the shack as the LA-1K is quite quick to trip (probably a good thing). I keep hoping a new firmware update will cure this but so far not. I'm on 1.07E
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73,
Jerry
Jerry Raia