xperia j video problem

[scottishlass]

When i record a video with my phone then play it back the sound has been sped up (sounds like a chipmunk) and finishes long before the video has what has happened and how can i sort it 

[Hampus]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

That sounds wierd. Do you experience the same behaviour in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008

If yes, I suggest that you perform a software repair via PC Companion:

http://www.sonymobile.com/global-en/tools/pc-companion/

In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.

Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.