I'll check the head set, the tires and the bb shell. I am hesitant to take it to a shop 'cause it will be like a car at a mechanic.

Well it does this and then you take it in and it never does that thing again. I know that the QRs are not very good I am working to replace them, but they are seated tight. I will recheck them.

@FB: could you explain this a little more:
Check that the rear wheel is square and centered by placing a straight edge against across rim on a secant, and noting where it meets the seat tube. Do this at the same height from both sides, and at the top and bottom of the rim, (all four must meet the tube the same amount off center)
Thanks