Default WIFI problems with ST25a

Hey guys. My Xperia U is getting crazy with his wifi.

I can't quite remember when it started to give problems, but now no matter what rom i use every time i turn on the wifi, the phone enters in boot loop.

I tried flashing back ICS but that didn't work. Now i flashed GB to give it a try, and in GB the wifi doesn't even turn on, it just says "error" and thats it. The 3G is working perfectly fine.

I'm still trying to figure this out, cause i really hope this is not a hardware issue.

Does anyone have a light on this?