apple health no longer syncing

Nort syncing for me anyway. all the exercise i did today has disappeared from the diary for the day. Yesterdays entries are still there. The fitness app on my phone and watch shows the data correctly. I have rebooted the phone, and double-chedked the Apple Health Settings (all are turned on). I also disconected and reconnected Apple Health in cronometer, and tried to backfill for the day. None of that worked. Any ideas as to what could be going on?