I am having this exact issue now, but it is intermittent. When it happens, the dampers are set to the highest setting and the ride is super bouncy. Took it into Ford, but of course the issue wasn't happening when I pulled into the service lane.
They sent me on my way saying that they have a 6 day backlog of vehicles to service and if the issue isn't happening now, there is nothing that they can do. Told me to bring it back in when it is happening again. I am sure when it happens I will be near the dealership, right?
Super disappointed in the level of service when you buy the most expensive F-150 they make.