i just got my 2009 ford f150 a while ago and the past couple of days when i go to start the truck it cranks for a little longer then it usually does. it has never done this, and all of the sudden it started to do this. is this a starter/battery issue? i took the truck into the dealer i got it from, (not impressed with their service) and they said "well, if it starts, it's fine" and refused to check it under warranty.