The first time it went quiet I was using the original EHX 150mA power supply included with the pedal. Sorry I didn’t think to check if the power supply was warm. It was the only pedal in the FX loop of my Line 6 HD500x at the time. I had just bought the pedal, so I was experimenting with all modes one at a time. I remember spring reverb was wonky, really low volume and distant. No knob or secondary function would fix it. Later all modes stopped working, like it was stuck in bypass. Pedal factory reset resolved both issues.

The second time it happened I was using my 1Spot CS12. The pedal was plugged into a 250mA output. I was mode surfing again, it stopped working again, like it was stuck in bypass again. That time I noticed spring reverb mode C, which I realized doesn’t exist. I switched to spring reverb A and it worked again. I could not get it back into spring reverb C again.

No idea how to reproduce this. I don’t recall if first was also stuck in spring reverb C. The only thing common was mode surfing.

Correction on my part.

I have the EHX 200mA stock adapter. I misremembered it. So first time was the 200mA adapter, not 150mA. Second time was one of the CS12 250mA ports.

Part no.: US9.6DC-200
Model: YXDC-41-1003
Input: 120V-60Hz 50mA
Output: 9.6V-200mA

I will keep an eye on it to see if it reproduces again before trying the techs.