I have the hotspot option thru AT&T on my 5, and never had a problem until yesterday. I connected to my laptop via USB and it recognized the phone, established an internet connection, and then dropped it. However, when I went back to my phone settings the Personal Hotspot option was missing. It simply wasn't in the list of options. I powered off and on - nothing. I checked my AT&T account settings and the option is still active.
Any suggestions? Thanks.