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Help Can't send MMS after a while if mobile data is on.

Well the topic sums up my problem pretty well.
If I have mobile data on (with wifi everything works just fine) I can surf the web and text just fine for a while. After I've sent a couple text messages, the sending starts to fail and my internet doesn't work anymore nor can I call anyone. Only thing I can do is to boot the phone, and then it works again for a while.
If I don't send text messages, everything works just fine, but when I start doing that it just locks up at some point.
Now when this lock happens, my phone still shows that my 3g is on (red and green arrows both blink from time to time) and I have several bars left on my connection bar.
I've tried swiching to airplane mode and back and disabling mobile connection and enabling it, but alas, nothing seems to work.
I'm running android 4.1.2 and this started just after I upgraded to JB.
Any ideas?

Ps. Is it hard to do a roll-back and get my ICS back as a last resort?
 
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