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The problem that is happening to people with some integrated intel sound cards (tiger-like, for example). Sound stops often, and a restart of sound server is needed continually. Seems to happen on 5.15.84 and 5.15.85.
Yup, that could be your case, and the only solution by now is to downgrade kernel 5.15, or better to change into 6.0 or 6.1. &.1 is the new default in Manjaro, so it’s a good option.
But: if you have a nvidia gpu, it will not boot properly unless you add ibt=off to the grub boot line.
See:
for example
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My problems were caused for many tinkering on config files experimenting trying to solve the suspend and hibernate questions. Or was this the mixing from the previous systemd and the new defective one? Sometimes they were not working properly, but just reinstall of systemd repaired that (except the suspend-then-hibernate). The problems did happen with linux515, and linux 60 and linux61.
I didn’t have the problem with the laptop not powering-off. But sometimes suspend or hibernate did not complete, and returned to the login screen, perhaps is related.
Hope that helps!