Nothing like being the first
It's definitely not the encoder, as there is no difinitive click in rotating the knob.
As far as the o-ring goes, I installed it inside knob, pushing it all the way down to it's resting stop, then with much finesse installing the knob on the shaft.
Out of curiousity, what is the thermal shutdown temperature?
By the way, this was experienced while installed in my boat, operating on a 100 degree+ day.
Am I pushing it? I have recently purchased a fan to help cool the unit, but haven't been to the lake to test it yet.
Mk2 #105 32g blue, w/tuner