Over on the international One X forum, we have a lot of people confirming a serious hardware fault where the wifi contact pins fail to connect to the antenna.
I am curious if this fault affects your s4 at&t version of the phone too.
There is a simple squeeze test you can do to check for the fault.
See the link here...
Fingers crossed your not affected by it.
*EDIT* HTC have confirmed the issue only affects the international HOX and the feedback this thread received seems to prove them correct. Great news. *EDIT-END*
Sent from my HTC Desire using xda premium