dell venue 3740 lte-T01c - Dell Venue

Hi.....
after i flash my tab 3740 lte with 4.4.2 v from opensource.dell/
When I set the timing automatically or manually
After a while the time does not stay the same and there is a big difference in minutes and hours
And if I reboot >>> the time returns to the normal shape
After a period of time >>also does not remain as I set it
I hope your help
THANKS​

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Hello Experts i need some help, I'm Newbie for android smartphone my first Android Smartphone is Dell Venue but i had some problems please help me
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