IOS – App icon duplicated with a ‘grayish’ overlay on iPhone 6 with iOS 8

Are you logging out of your Apple account?

One possibility is that you are being logged out of your Apple account for some reason, either automatically or manually. If you are logging out of your account manually, then that's probably disabling iTunes Match because the service is attached with your account.

There are several situations in which you will be logged out of your Apple account automatically. For instance, when I first started using iTunes Match, I noticed that for some reason iTunes Match kept turning off. I later realized that it was because I had apps from different accounts installed (such as two accounts from different countries), so when I logged in to a different Apple account from the one that I use for iTunes Match so that I could update some of my apps, iTunes Match would disable itself.

Try clearing the cache

The cache could also be causing problems. I know that it this happens on the desktop version of iTunes; I'm not so sure if the iOS version also has cache problems, or at least I don't know if it's possible to clear any part of the cache on iOS.

To clear iTunes's cache, here are some helpful instructions.

Unfortunately, there's no way to change the Recent calls timestamps.

You will either have to wait past the 1/12/13 or you could consider deleting those numbers. Course, you would obviously lose the phone numbers, and that data, but it would keep your true recent calls on top before it starts working again on 1/12/13.

It appears to be indeed changing time on the iPhone that has caused this issue, as I was able to repeat it easily. In testing it, I switched off "automatic" time, and change the date to tomorrow. After that, I made a phone call and then changed it back to set the time automatically. The phone call that I made during the manual time change indicated that I made the call tomorrow. 1/10/13, in this case.

So, your iPhone uses local time - the time that displays on the phone at the top of the screen - to log, order, and display recent calls.