My sony Z2 screen flashing red line each corner.

[Aaron90]

The red line appearance flash 1-3second then stop. After a while, it flash again. Help me.. Is there something wrong with my phone.?

[Uliwooly]

@Aaron90

Have you exposed the phone to water?

[Phy · Accepted solution]

1. Settings
2. Developer options
3. Turn them off

[Phy]

Boot on safe mode and check if you experience the same issue.

How to boot on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

How to boot on safe mode on Lolipop
1. press and hold the power key
2. once you get the pop up menu
3. press and hold "power off"
4. Boot on safe mode should become available

[Aaron90]

Really helpful info. Thank you so much. My phone OK now.

[Phy]

No problem. Glad we could help.