Raiju Quartz Tournament Square Button Problem

Hi,

I very recently (within the last few days) bought the above mentioned controller for my PS4.
First time I used it, absolutely fine and this was yesterday. Today, I start my game up, everything is fine and then suddenly, the square button stops working - not responding to my pressing it at all.

The M1 key works in place of it, so I figured I'd just remap everything and it would work again but nope, square button refuses to acknowledge being pressed.

I have sent a support ticket, but figured I'd asked here and see if anyone has any ideas what's happened to make it stop working?

Many thanks!