keep losing the signal while call is running

[samer711]

Dears,

my problem is in my new phone Z3 Dual, every thing in the phone is good and running properly but i noticed one problem recently.

when i receive calls or starting calls, some time the signal is suddenly lost and call broke and i lose the phone call then it works again.

my sim is nano sim and works just fine.

kindly advise

[_alexdon_]

Can you check if the same occurs in safe mode?

/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

[sonyabraham22]

I too noticed the same issue after update Lollipop .5

[Uliwooly]

@sonyabraham22

Follow @alexdon 's advice and report back.

[sonyabraham22]

Tried, can't see significant difference in signal levels. Shows same as normal mode.

[Uliwooly]

@sonyabraham22

You should check with your network/carrier regarding their network coverage, they might be experiencing issues. also, if you don't have a nano SIM card, it'll be wise to get one. 

[samer711]

The problem is not always happening, by chance may be one or two time in two days. But i noticed it after the new update.

[samer711]

And as a network or sim it's fine. I where having experia z and no network problems noticed before.

[samer711]

Regarding the safe mode.. I tried it but i didn't understand the goal of it. The results was normal and no changes have been noticed uptill now.

[Uliwooly]

This is what I would do @samer711

1. contact your carrier/network and ask for any network coverage issues

2. get a brand new NANO SIM card, don't get a regular SIM card and cut it

3. repair the phone with PCC or Bridge

4. DO NOT install any antivirus or taskillers or battery apps, sweepers etc. 

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355