Why my phone LG MS323 OPTIMUS L70 does not connect to the WCDMA network mode?

[Ndayishimiye Ayubu]

Here are my device details: Android Version: 4.4.2 Baseband Version: M8610B-AAAANAZM-1.0.6038 the Kernel version: 3.4.0+ Build Number: KOT49I.MS32310c Software Version: MS32310c.If I change the network mode and I put my WCDMA networks is lost immeditemment