I need some advise on a bike chain issue. We purchased a fairly new bike with all high end components to race at worlds. The bike chain has come off 4 times while cornering under load. I have taken it to 2 bike shops and no one can figure out why the chain is coming off. Alignment is about 3mm out from front sprocket to back cassette? Could that be enough to cause the chain to come off under load? The chain tightness look okay and has some travel in it, perhaps an inch up and down in total. I’m at a loss as as there appears to be no teeth issues or chain link stiffness. The chain seems to ride in the middle of the teeth.
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Any advise would be appreciated.