Mine does the same thing also but at 1600-1700 or so. Sounds like it's right behind the radio. Grinding/rattle sound. I posted a video on Facebook. On the Ford maverick page. It won't let me post here. Mine did it off the lot. I didn't notice it until a few hours later.
3/7 to 3/21 to 3/28 and back to 3/21. Got the email at 8pm tonight. This is pretty common from what I read. My 3/21 should hold now. FX4, 4k tow, spray in liner.
Get it built so they can park it, in an empty lot in Mexico. I have a build date of March 7th but due to the chip shortage, I can't even be excited about it.
Crazy how guys from December are getting build emails before guys with same builds from Sept and October. I ordered Dec 16th and don't expect one for a month.