Network setting is changed to WCDMA Preferred when connected to Wifi

Network setting is not changed at little time, but seems to be changed when Wifi is connected for a long time.
Is there the solution?
Model:C6903
Customization Version;1276-7948_R5C(HK model)

Hi Erisis,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
With the information supplied, I can advise that this is likely related to an application changing the setting. I suggest that you try use the handset in Safemode and see if the issue continues.
1. Turn handset off
2. Turn handset on
3. When you see first splash screen hold down Volume Down key until handset is completely on.
To turn Safemode off simply turn the handset off and back on like normal.
Let us know if the issue continues.
- Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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