QC ultra: not turning off anymore

See title. As of a few minutes ago my QC Ultras do not turn off anymore. When long pressing the button, it immediately tells me „ready to pair with another device“.

Powering them on/ off was crappy before. But now not even that works anymore. They play fine, can switch devices ANC modes and all that. They just won’t turn off.

Any ideas what I could be doing wrong?