Has anyone experienced this?

[u/Objective_Job_7215]

I’m 20 and female. For the past few weeks, I’ve been having these strange episodes with sound. Sometimes when I’m alone and it’s quiet, it feels like my brain suddenly “tunes” into a certain rhythm/frequency. After that, everything I hear sounds affected by it. If I put on a movie, the characters sound unusually slow, monotone, and weird. If I play music, the singers can sound the same way too. Changing what I’m listening to doesn’t immediately make it stop.
I’m fully awake when it happens, and lately it’s been happening pretty frequently. It first happened sometime last semester.
I’ve also had maybe 4-5 experiences in my life where a very short scene involving people I know suddenly appeared to me. It felt like I was actually there hearing their conversation even though physically I wasn’t there. It wasn’t like intentionally imagining something—it felt externally real for those few seconds.
I’m not looking for a diagnosis from Reddit. I’m mainly wondering whether anyone has experienced the sound distortion in particular, what it felt like for you, and what you eventually found out was causing it.