My UFX+ is suddenly showing low level signal activity across all 12 analogue ins & main outs even when nothing is plugged in. randomly (every hr or so) all 12 signals occasionally leap to 0 db and fall back down instantly. 

The same is reflected in TotalMix. Not seen this happen before, not changed USB cable or any inputs/outputs to/from the device. I’m running a ferrofish pulse 16 over madi but this behaviour occurs whether that is switched on or not. Mains connection via a power conditioner.

Has anyone experienced this?
Thanks