My buddy had the EXACT same problem in his ram. He replaced the Battery, it still did it, then he replaced the terminals and now it runs fine, and hasnt had a problem in 3 weeks.....so id change the battery and teminals.

 

Thanks guys for all the info, I really appreciate it. I'm deffinantly going to change the Battery sometime next week and hope that fixes it.

 

I'll say it's the alternator...........which probably trashed your battery.