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Do you have flashnotify? That was causing the same thing on mine, when I uninstalled it it went away.
It did it even after I checked the call. It was driving me nuts.i know for flashnotify, if you don't go into your dialer and check a missed call, it will keep flashing.
as for the OP - do you have 'use wireless networks' on under security & locations?

Do you have the app 'spare parts'? If yes, what do you have your 'end button behavior' set as? If no, then get it and check the end button behavior.![]()