MacBook Pro speakers suddenly got quiet

Hi, I have recently noticed that my 2016 MacBook Pro 13's (non-touchbar) speakers got very quiet so that even at max volume they sound the same as half the normal volume level. I have tried fixing it by resetting VRAM settings as suggested in this thread, https://www.quora.com/Suddenly-my-MacBook-Pro-13-inch-is-giving-a-low-sound-outp ut-when-compared-to-the-first-time-What-… But it was only a temporary fix as the next day the problem reappeared. I would appreciate if there is any permanent fix available to this problem. Is it just me getting this problem or is it common in these macbooks?

Thanks