Originally Posted by moreje
but I did not flash new radio since many weeks.... and my last ROM flash has 2 weeks old...
The problem came suddenly, without any new flash...
But I can try recent radio, to test...
That's why i suggest you to return the phone for mantainance: assuming you haven't flashed a bad radio, if your radio is just wrong or not up to date for the rom you have you may have signal issues, camera not working and more, but even those problems should be encountered as soon as you flash it, not days later.
Another chance, now that i think about it, it might even be a broken sd-ext messing up. Did you use data2sd or some script of any sort when on MIUI?
Nokia Lumia 920 White
Asus Transformer TF300T
Cowon J3 16 GB