Lock Signal Bug

ZF Model: ZB631KL
RAM: 6G
Firmware/APP Version: WW-15.2016.1812.179
Frequency of Occurrence: phone can't lock the signal from dial *#*#4636#*#*
Rooted: No
APP Name:

after iam update to WW-15.2016.1812.179 .. signal Low and cant lock the signal...
any people helping for fix it ?

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