Thanks again everyone for your thoughts.

Dimi3, I haven’t tried the update yet, but will over the next couple of days. As mentioned, the last few times I’ve tried the machine it’s seemed ok. This is without doing anything new to try to fix it (I had previously tried lots of factory resets and updating the OS). So it’s difficult for me to know if it’s a software issue that somehow righted itself out of nowhere, or a dodgy pad that’s improving itself the more it’s played.

After seeing the videos I sent through Elektron seemed to think it warranted me sending the unit back to them, and other more technically-minded friends (whose advice I sought) seemed to think it was likely to be a hardware issue.

The problem is that there’s no real way for me to be sure, and just the chance that it’s a hardware issue that could rear its head at a later date (especially mid-performance) makes me not really trust the unit. As TrabanT said, the fact that it’s been a bit of a process to get this far with a replacement unit makes not want to take a chance on this one and see what happens. I feel like I should just follow this though now and be 100% sure about the unit (as much as you can be, anyway).