According to ArcGIS Online Health Dashboard, there are indeed "intermittent issues" with Hosted Feature services as of me posting this at 9:26AM, EDT:
It also looks like this was the same situation on March 12th, which you mentioned was when you experienced this same behavior.
I know you said that that the status dashboard is "rarely accurate", but it can at least be a good resource to check to know if it's a site wide problem or not. In this case, they have it documented that there is a known issue, and my guess is it will likely be resolved in a few hours or so. However, if you check the dashboard and it says there aren't any known issues, that's when you know it's time to bring in the big guns and get help from Esri Support
Best,
Katie
“The goal is not simply to ‘work hard, play hard.’ The goal is to make our work and our play indistinguishable.”
- Simon Sinek