Given that riders much stronger than us use aluminum and cf bars all the time, I would suggest getting all of your bike parts checked for tightness and that things are in proper condition. Stem bolts of all kinds etc
Unseen diagnosing is of course impossible, but you may have a preexisting problem with your bike.

Around here, cheap heavy steel straight bars will be found in any used bike shop, if they haven't recycled them.

sprint away!