scheduled posts on shared social media calendar revert to draft status

Scheduled social media posts on Facebook, Instagram and LinkedIn have reverted back to drafts at least four times over the past approx. three days, including three times in the past hour (1:56PM ET). Facebook and Instagram content were scheduled several days ago but were revented to drafts as of at least Friday, 12/5, around 4 PM ET.  A LinkedIn post and a separate Facebook post were scheduled on 12/5 around 4 pm. ET. On Sunday (12/7) the Friday-scheduled post *was* successfully published. Today, all scheduled posts on our shared calendar have reverted back to draft sttus multiple times despite updating scheduling times. 

Work done using either Chrome or Microsfot Edge browsers (at least 2 users), Mac laptops running Tahoe 16.1.