Ah, I'm so glad I finally found this! I just added a new feature to my watch app and spent the last 3 days trying to figure out why my app would suddenly start freezing after a few minutes in the background (and stay frozen through a reboot which shouldn't be possible). Claude told me my app was likely being penalized by the OS for using too many resources, though I've always striven to keep this app as memory and battery efficient as possible. Welp, I guess I'm blocked from shipping any updates until this is resolved.