My AppleWatch 6 stopped giving me blood oxygen readings on June 3. The watch also seems to be not waking screen on lifting my wrist either, but will unlock my iPhone when wearing a mask. I have rebooted both watch and phone. I think the version of WatchOS is 7.6 (18U5523d) and my iOS is at 14.7 (18G5023c), both public betas but the watch was working fine on these builds. Any suggestions to get the watch working properly again? Is it a sensor issue?