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This might not be helpful... But you said you're desperate.
I'm not a mechanic by any means, but when you mention the consistency of 3-4 minutes I think of heat finally reaching some of the components. I know that when heat develops in most anything, things begin to expand. In relation to my story below, have you ever checked the integrity of all the pulley's or anything connected to the belt that contains any sort of bearings?
I have a 96 328i. Years ago I knew little about the car. It had a funny jerk one day when driving and most noticeable when accelerating and idled poorly. I kept riding in it for a couple days cause I was too busy and poor to attempt fixing it and my serpentine belt actually broke and took two fins on my radiator fan with it. My center tension pulley (not the a/c tensioner) had seized up and was rotating off and on. During its last few days, the pulley actually wasn't making any noises.
Again, I know that might not be helpful, but you never know.
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