yah...in temps under 70 degrees on a decent (usually in the morning near the start before warmed up), i will occasionally experience "shiver shimmy." not fun.
have to scrub the speed to 25 mph or less to negate. now actual shimmy-not including cooler temps-is not a good time. i've had serious crosswinds seemingly bring on the shimmy
at 40+ mph and it was all i could do to avoid crashing. so front-end wobbly. had it happen on aluminum/carbon and steel frames.