It's probably more of a design issue; the built-in speakers can't handle much bass. Maybe turn the volume down a notch or use headphones with better bass response. If the problem is constant and a serious problem, you could try a warranty return, but be advised Meta will send you a refurbished unit that might be older than your 2-month old headset. You could try to get a refund, perhaps, especially if you didn't buy directly from Meta, then buy another new headset, but that depends on where you purchased from and their refund policy.
Given that it took 2 months before you even noticed the issue, I guess it is not serious, so probably just ignore it.
