Hi Milo,
Sadly after doing some research it seems that many users of these headphones have this problem. One solution you might try before warranty is if you connect your headphones to a computer you can update the firmware on your headphones.
Sony has a very nice guide on how to apply the newest firmware to the headphones through their connect app here.
[link|https://www.sony.com/electronics/support/wireless-headphones-bluetooth-headphones/wh-1000xm3/downloads/00016733|Sony Firmware update for Headphones.|new_window=true]