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The message "dial is locked" is normally only displayed when you turn the
tuning pot while you are in TX.
Apparently your Raduino occasionally "thinks" that the tuning pot changes
position while you are in TX, whereas in reality you didn't turn the pot.
This could be caused by some RF noise on the ANALOG_TUNING line (which
connects to the tuning pot slider).
It is important to have the supplied 0.01uF cap installed on the pot to
reduce noise.
RF noise can also increase when SWR is poor. Perhaps your SWR meter
somehow affects your SWR when it's turned off?

73 Allard PE1NWL