problem with 3g connection

Hi all
I'm using Joying rk3188 1024p with Huawei E1750 3g dongle.
My headunit is rooted installed stock rom and there is 1 USB starage for music.

When I drive my car and after 30~60 minutes 3g connection lost.
The icon of 3g signal disappear(Triangle shape) and there is no connection before I unplug and re-plug dongle.

I tried call-pppd script and wired external power to USB hub (5v 1A) and there is no luck.

Any comments or simple solutions will help me.

Thanks

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