Polling drives almost everything in DC (except climate change and higher taxes, no matter how unpopular, they will always ride those), so I would hypothesize that someone figured out the Jan.6 commit only plays to the base and hurts them with independents.
I said months ago that holding those stupid January 6th committee hearings on TV while ordinary Americans are dealing with a lot of disruption in their lives was the dumbest political move they could have made.