Hello I have this buzzing noise that comes on after I hit 50ish miles. It started to do this while going over 65 but went away in seconds. 3 days later it is now doing it non stop when I go past 50 and won’t stop until I go below 50. Please look at this video to see the noise. I have noooooo idea what it.

 

ever think of crawling under the car to look around? That's where I would start

 

Sounds like something rattling.