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    Default Lenovo P780 & Bluetooth STRANG problem

    I'm havig the strangest problem with my new smartphone: in some areas (central Israel), after dialing a phone call with car bluetooth speaker device, I fall off the network and after few seconds the phone reconnects. It' terribly anoying especially since it hardly happen in the northren part of Israel.

    When I make the same call (same destination from same location) with the phone without the car kit, there is no problem.

    Sometimes the same problem appears when I try to dial, before it rings in the destination.

    Other problem, probably related to it is the sound quality- many times the other side claim he can hardly hear me.

    When receiving calls, there are no problems (or, at least, very rare)

    I tried several attamps to find the problem but can't find a clue of how to solve it, how to focus the issue and not even what is the source of the problem.

    My provider claims that since I reconnect almost immidiatly (and didn't have this issue in an old device) shows that the problem is with the device and not with the network.

    Tests done:
    As pointed out it happens only in some areas and not everywhere
    I tried several car bluetooth kits, the problem remains
    Using an old device (Galaxy S)- there is no problem
    Tried SIM card of another provider- no problem
    Tried to change Modem software- didn't help

    My configuration
    Device: Lenovo P780
    Android 4.2.1

    Ideas? Hints?
    Other places where I might find answeres?

    Thanks

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