My v1.2 Axoloti just got very hot in the vicinity of the audio output jack, seemingly when I plugged something into the headphone jack. Everything seemed to be functioning properly otherwise except that there was a decent amount of high-pitched noise in the audio signal. No patch was running. I power cycled once to see if it the issue repeated, and it did.
The headphone jack was connected to my audio interface, and both the interface and the Axo were plugged into the same USB hub, which was powering the Axo.