Touch screen freezing and unresponsive

[RuntyBIGFOOT]

Over the last week or so my L4 has developed a touchscreen problem it will freeze and become unresponsive untill I lock it and unlock it it is starting to happen more often now can anyone help me resolve this issue thank you

[Uliwooly]

@RuntyBIGFOOT 

The more info that you share the easier it'll be to help you out.

Does this happen when the phone its hot? or when you have multiple apps/games open ?

[RuntyBIGFOOT]

It happens when it gets hot and when I'm playing game since my post I've done a software repair  using Xperia companion but it still freezes and unresponsive.

[CosmicTomato]

If you have an SD card inside, try the phone's act without it inserted.

[RuntyBIGFOOT]

I've already had my SD card out my phone it makes no difference I've also done a factory reset of my device that didn't work I've tried safe mode to find out if it was an app I downloaded I have tried everything you can think of and nothing has worked only thing I've not been able to do is update my firmware and security I know there an update for my phone but my phone say its up to date 

[CosmicTomato]

If the phone's completely acting up and the software fix doesn't fix it, my guess would be the issue is beyond software, you may need to send it to Sony to check it out for repair.

[RuntyBIGFOOT]

How do I send it for repair

[Strampke]

Open the Support app on your device.

It shows you how to contact Support by mail, chat or phone.

The latter of course during office hours.

Support will help you with the procedure.

[Rinky.104]

I am also having this problem it also writes rubbish on its own 

[Piscie]

Hey, have you followed this?