my truck runs great and no problem with anything except every so often it wont crank and after I wait 15 min it cranks and runs fine. in 2013 it did it maybe once a year and then once every 6or8 months, but recently it has done it two days in a row and it always does it around 9:45 pm when I am leaving for work. can anyone tell me what this is. the auto repair people say they can check it if I bring it to them when it happens, but that would mean it was running and if it is running then I don't have a problem. HELP