Share your experience!
Could you elaborate?
Are you saying that the overall phone lag if you lose your network signal?
do you have any antivirus or taskillers?
How old is your SIM card?
Repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Hi vlaxos,
Welcome to the community,
You may also want to try replacing the SIM card, as this only seems to happen when using SIM card functions such as 3G networks.
let us know how you get on.
I see, then this may very well be SIM related, I definitely suggest trying another SIM card in this instance.