Hello and sorry for my poor english...
My phone don't receive 2G/3G signal several time per minute, and sometime it runs perfectly, and does the same again and again.
The SIM card perfectly works in an other phone in the same place.
An other SIM card, from an other brand does the same exactly.
I have done a factory reset, but nothing better.
I have done a firmware update by OTA, but nothing better.
I suspect a bad contact between mother board and the antenna.
What could I do ?
The phone is used only since one month, and i thought that it was a firmware mistake.