Story of some hams who tracked down a "Ditter" I think the found the culprit and he had only one thing to say in his own defense "MEOW"
When I built my computer/radio interface.. I included a hard OFF switch in the transmitter control line.. If I turn it off and the computer tries to tranmsmit, perhaps cause Kitty walked across the keys (I have 2 cats here) the interface looks like it's transmitting, but the radio shows RECEIVE. There is a reason I put in that switch.. As for the paddle.. It is also locked off when not in use