Right jogwheel not working on U-Mix Control Pro 2

I've had my U-Mix Control Pro 2 for several years. I've not used it for a while, and I plugged it in to my Mac again today. The right jogwheel is not working in Vinyl mode, and I'm unable to scratch / seek. I can see that others have had this problem in the past but I can't see any fixes for it.
What's really strange is that a couple of times today it's suddenly started working - I can scratch / seek for a few seconds, but then it stops working again.
I was using Cross DJ 3.3.10, and I've updated to 3.4.3 but it hasn't fixed the problem. I've never touched any of the mapping settings.
Can anyone help?
Thanks
What's really strange is that a couple of times today it's suddenly started working - I can scratch / seek for a few seconds, but then it stops working again.
I was using Cross DJ 3.3.10, and I've updated to 3.4.3 but it hasn't fixed the problem. I've never touched any of the mapping settings.
Can anyone help?
Thanks