I've noticed the sound becoming wobbly on some songs or entire albums. Here are some examples:

https://open.spotify.com/track/2CZmBzkAKzimNWmN8RKXk1?si=lImUmPNoS_6pIwoVFNLK_g

The distorted guitar in the intro sounds like it has a rapid, deep vibrato effect. It should not sound like this, it's not that way on the record.

Another example:

https://open.spotify.com/track/47YgDtZfe9vCEKZXihM1l8?si=s4X8XWe1S9qNzZNAei18pg

Same thing can be clearly heard once the distorted guitars start at 0:22.

I've noticed this started maybe a couple of weeks ago and seems like more and more tracks are being affected by this.

It happens on various computers and operating systems, both on the desktop client and the web player, using both high quality playback and normal quality, both with volume normalisation and without.

Can't seem to find this issue reported anywhere yet. Is anyone else having this issue?