iTunes Match subscription says expired
I just got the iPhone 5 and I have iTunes Match subscription until July of 2013. So plenty of time left and I have it turned on on my phone and when I'm on wifi it seems to work fine but if I'm on cellular data after about 20-30 minutes of using it it says my subscription is expired and everything stop working. I haven't tried to call apple yet but it's extremely frustrating. Anyone know what's going on?
iPhone 5, iOS 6, iTunes Match