Hi All - we have mitigated the issue and are seeing error rates drop - we will continue to investigate the root cause, please reach out and raise a support request if you're continuing to hit issues.
Unfortunately, I'm still seeing issues connecting to SharePoint lists. Instead of the server error, PowerApps constantly tries to connect to the SharePoint lists. None of the lookup and choice fields are populating correctly.
I posted this at https://powerusers.microsoft.com/t5/General-Discussion/Power-Apps-not-connecting-to-data-source/td-p... as well, but posting here as this seems to be the main thread.
We're not getting error messages anymore, but our apps currently don't appear to be able to pull data through our connections to SharePoint.