Default Xperia U wifi constantly disabled

Hi there.
Some 15 days ago my phone's wifi stopped working suddenly, it keeps disabling it constantly (screen shot).
any idea to help me?
I'm on GB Rocks ROM.
Attached Thumbnails
Click image for larger version

Name:	screenshot_2014-02-23_1633.png
Views:	26
Size:	177.6 KB
ID:	2596289