Head bobbing & weaving during breastfeeding?

Leanne
My little guy (almost 10 weeks old) has been bobbing & weaving his head & kicking his legs (& refusing to re-latch) mid-way through a nursing session for the last 2 days & this afternoon it got to the point where he couldn't overcome it & couldn't/wouldn't finish his feed, despite the fact that I know he was hungry (he eventually got & drank most of a 4oz bottle of breast milk). 
I have a quick/strong letdown, but that doesn't seem to bother him (he doesn't pull off the breast during it & continues to drink for several minutes afterward), so I don't think that's the problem. It always happens after a burping break (he burps fairly well) & I can't figure out what's wrong or how to help him, but it's starting to impede his ability to nurse & that worries me. 
Any thoughts about what's going on? Anyone else dealing with similar issues?

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