IAP not working and freezing headset.

We have an app on the Meta Store where IAP has been working perfectly fine. 
Over the past month we have noticed a spike in mobile purchases and zero In app purchases. Upon investigation it appears that in headset when you try and make a purchase, it allows you to select the item for purchase, see the details of said item, check the consumer agreement box and put in your pin.  But as soon as you hit purchase, it hangs for a few seconds then displays "oops, something went wrong, try again later", then locks the headset so the only option you have is to reset the headset. (Though some of us never got that far and it locked the headset out immediately on selecting the item)
With the last update we pushed and for a few months, everything was working perfectly fine with the IAP system. Now, with no update or build from our side, it is not working. 
Any help would be greatly appreciated. 

Cheers