NO WIFI in Prefs

I Start this thread because after using the Search function nobody could help me. I got an OOTB 1.1.2 KW45 Iphone with 4.6 and using Nextsim. Everything was running fine until yesterday evening... I'd like to go in Safari but couldn't get an connection so I checked my Prefs and there stood "NO WIFI" I thought okay tommorow I'll restore and then everything will be fine. This afternoon suddeley my WIFI was back for some minutes and then there was the same problem. I restored to 1.1.1 and liked to Jailbreak and so on but the WIFI also isn't usable... PLEASE HELP ME!!!

Sorry for my bad english....

regards from germany