Ok, I had different issues with the A72 model so far, so I've tried 3 of them (including a motherboard swap from official local Samsung service) the previous one had a vibration very weak, but pretty constant on calls and messages(feedback on key press sounded like a fart tho...) this one has a more distinct "thump" on key press, but for the rest... It is weird... Starts off high pitch then kinda fades. If another vibration occurs right after, that will be constant, if some seconds are passed, it starts off again more powerful with quick fade.
Exemple in video https://youtu.be/jhQQng9QHdA
Should I worry for any possible problem? Is it normal to have such different motors on the same model?