Possible RF issues? Everything always works great within the RF choked and optimized space of my shack, it's always outdoors with a temporary antenna and ground (or no good ground) that I start seeing random issues, even with just a few watts. I like to bring a small dummy load along (for example, Hans' inexpensive little kit!) and if I have no problems with it, I've narrowed the issue down to my antenna setup. By "fed halfway," do you mean a dipole or something else? I tend to have the most RF issues with end-fed half-wave or random antennas, even with counterbalances so a couple of inline chokes always come along for the ride.
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Lawrence KC6WOG