I am experiencing weird problem with my iTunes Match subscription. Ever since upgrading to iOS 6 my devices spontaneously turn off iTunes Match this happened twice so far:
First shortly after upgrading my iPhone 4S and the new iPad to iOS 6. I upgraded, downloaded some songs and about a week later all my devices (inc. PC and a MacBook Pro) got iTunes Match turned off. This wasn't a problem for PC and MacBook as iTunes doesn't erase the music from them, but I had to download all the songs on iOS devices again.
Second time happened today - my PC and iPad got iTunes Match turned off. Again - no problem for PC, but have to download my music onto iPad all over again. You can imagine how time consuming this may be especially considering you cannot upload the music from desktop iTunes once you have iTunes Match on.
Any ideas why this might happen? There is absolutely no involvement from my side when this happens. All ma devices run latest Apple software (iTunes, OS X and iOS).
Where should I report it if I wanted to complain about it to Apple?