Audio glitch getting worse

For a while now I have been getting a glitch in TikTok where audio from one clip will continue to play after I go to another video. I usually just close the app, restart it, and it's all good. But the last few days, the audio has persisted even when the app is fully closed on my phone. I have to restart my phone just to get the audio to stop playing. Any ideas what's causing it, and how to stop it?