I have a 2006 Chevy Uplander, I just recently put new wheel bearings, control arms and axles in it and I had it lined up. I also changed the battery cable ends recently and the wire was a little corroded when I put the new ones on, wiped them with a rag as I had no brush. I have drove it about 400 miles so far and it has been great. No check engine or anything popping on in the dash to say anything was wrong. Today I went to town and shut it off, got out and bought my stuff, got back in and nothing. No lights came on, no seat belt buzz, no nothing, radio was also off. I popped the hood and couldn't see anything off, got back in to call someone but decided to give it another try. Switched the key on and it cranked right up and I went to a few more stores and it never acted up again. The radio clock reset to 12 on the time so all electrical must have been off. I am stumped as no warning lights or anything is on and the van runs great. 180,350 miles on the engine so it hasn't got a great number of miles. Thanks for any help anyone can give me.