Unexpected call drop

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Hy guys, maybe I have a problem on my terminal: when I am in a phone call it happens that he cut off the conversation without pressing the end button (even if on speaker and phone on the table, nobody touching it).
It did twice of self reboot since I bought it ( some months) and no one since long time, so I don't think it's MB fault... At least I hope...


Sent from my LG-E900 using XDA Windows Phone 7 App

Developer unlocked (through registry), flashed firmware from Vodafone it to TIM then OPEN... (But I think doesn't matter the firmware), Already tried to reboot and battery pull....
One last thing, it happened, couple of times since I have it that he showed instead of signal bars a simbol with SIM and a logged signal, like "invalid SIM"... Went in offline mode than back online and back working, no restart required

Sent from my LG-E900 using XDA Windows Phone 7 App

Up

Sent from my LG-E900 using XDA Windows Phone 7 App

Usually if 3g is on and you can't pick up 3g signam it keep cutting out, so if I'm not getting proper 3g signal I switch 3g off in the settings and everythings works ok.

Sent from my LG-E900 using XDA Windows Phone 7 App

I have the same problem, even after a reflash it drops calls, and sometimes has problems reconnecting. My operator is WIND, something tells me it's relevant... Awful signal and audio quality!

If its running in 3gmode and looses 3G signal--> call drops because the phone is registering in the network over GSM again