Shambeh

Hello, (Audio reference shared below) So, for the first time since I’ve used the car it suddenly starts rattling on longer drives (30-40min+). As if I am driving a car that has square tires not round. Best description I can give. It starts off as a minimal shake and then gets exponentially louder and more shaky. During acceleration and breaking as well. The effect affects both the same way, probably a bit more when you are slowing down. Stopping the car only resets for a bit and then it comes back. The issue is mainly felt from the back axel or tires, I am not sure. I did wheel alignment and it reduced the rattle drastically, however on longer drive it does come back, and goes away. So somehow the issue is there just reduced. Two different mechanics told me different things: - ABS system is faulty - Rear differential is failing + rear bushes need to be changed. I did no changes to the above yet. Need to know if anyone experienced this, and how to fix it? What’s the actual issue? audio sample here: https://drive.google.com/file/d/13boDvezqstfysR7nRQ0yksP1JSB0nO6b/view?usp=drivesdk Hope it helps. Thanks.