Yes plenty I am a tech at a dodge dealer we are currently doing the fourth one now and the cylinder heads are on back order so it is deffinately an issue
Well I have a 2011 Caravan as a company car. It has the 3.6 and when I start it sometimes you can hear the lifters chattering for a couple of seconds. The van only has 18,000 miles on it, I hope it's not a related problem to what you're talking about. I guess I shouldn't worry about it because it is a company car and I'll only have it a couple of years. Anyway I do love the vehicle and the power is AWESOME!