There is a little more to it than just pure speculation. Having seen others with similar issues here and issues that a few long term members of this forum have experienced, we have been able to trace a lot of problems to various apps. Personally I experienced a freeze caused by an early version of the Nokia Transit app which has since been pulled and updated and re-released.
WP8 being so new means practically every app for it is "beta". Personally I have taken to installing apps one at a time and leaving it for a few days to monitor the new app before installing the next. What I also do before I install anything is to do a search here to see if anyone else is experience problems with the app.
There is nothing in the description which tells you if an app is converted from a WP7 version. I know from having seen it previously for my Lumia 800.
banlec wrote:In my view, if this is the case, then this means failure in design - the app should not take control over the system!
Especially, if there is no way to kill an unresponsive app.
Interesting you should mention that. We were just discussing the the last day the OS isn't quite robust enough and probably needs a little more tweaking on how it handles bad apps. Also another interesting fact is some people have reported the phone getting hot when it freezes which could be an indication of the phone trying very hard to perhaps shut it down. There have also been reports of frozen phones unfreezing and going back to normal if left long enough.
However, teething problems like thee are only to be expected with any brand new OS. We are talking about Microsoft afterall.
OK then it is probably not app related in your case, which leaves the sim or something else. The sim you can check by trying another sim. Are you using 4G by any chance? if you are also try setting highest connection speed to 3G just to try. If that doesn't work then it is trip to the Nokia care point I'm afraid.
