Xperia T looses 3G/H+ connection each ten seconds.

[diezLmedia]

My Xperia T looses 3G/H+ connection each ten seconds, only when Extended stanby mode activated. The 3G icon switches to H+ sometimes wich is normal but 10 seconds after the icon dissapears and I have no connection. Then it starts again with the 3G icon... then H+... then nothing. Tried restarting phone, reseting to factory, they even changed my phone I got a new one and I realized that it was only doing it if I was using the Extended Stanby Mode.

What do I do ? I need this feature because I charge my phone once every 3 days I don't have time to plug it that often.

[Uliwooly]

That's poor network coverage, it seems that 3.5G/H+ its not that good in your area and that's why it keeps switching to 3G, contact your carrier/network and ask about their coverage 

[diezLmedia]

It's not poor coverage, because when I deactivate the extended stanby mode it connects to h+ and never disconnects.

[Uliwooly]

You could repair your phone with

Update Service (SUS)

http://www.sonymobile.com/gb/tools/update-service/

http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

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

Don't forget the Kudos