Homepod audio changes overnight

I use my homepod in my bedroom for white noise. I used to be able to set it for repeat 1 and it would play all night no problem. Over the last couple months, same setup will only play for an hour or two.

Additionally, there are nights (like last night) where it will stop playing my selected track that's set to repeat 1 and start playing something totally random. Last night it was another type of white noise. But at a different house last week, it changed randomly to a piano track.

Very disruptive nights.