Sorry I don’t visit here often anymore but they told me that they replaced the chains and tensioners. That seemed to have fixed it for me. Did you have them look at yours? Did they fix it?
Took my car in for the backup camera recall and told them about this problem. They couldn’t figure it out but they said a ford engineer would be coming down to diagnose. Hopefully can figure out what this is once and for all.
Bingo. Same for me about the behavior related to temperature. Took it to a local shop and of course it doesn’t do it when the mechanic takes a look:cwl: . Really bugs me that there is no known cause for this.