Wifi keeps turning off, on my Samung Galaxy 5s

A

AC Question

The Wi-Fi turns Itself off & wont turn back on, took it back to the shop twice, it works in the shop when I pick it up, get home after about 2 minutes it turns off & again won't turn on.

I have got another phone which works fine & my girlfriend's Samsung Galaxy s3 works fine, I have reset the phone to factory setting & it still wont turn on.

If I leave phone off for a couple of days & then turn it on it works for about 10 minutes.

I have read all the threads on this site relating to my problem, have tried most things that have been suggested, nothing works.