Make sure your system is up to date, if there are any old drivers for your wireless adapter that are messing it up and good update would do the trick. If all your software is up to date (do check if the specific drivers for the wireless adapter are up to date even after an OS update to make completely sure) and the issue persists; it is possible its a hardware failure on the wireless adapter. I would replace that part if its not soldered on...I hate when manufacturers do that.