salesforce reports

I'm having issues pulling Salesforce data, yes - not reports specifically but I have a tasks & events table that's been humming along fine for months, but has failed for at least the past week. On the desktop I can go to the query editor and force-refresh each table individually, but my same application also exists in an online app and I don't have that capability there - so half my data is obsolete or just plain missing!

Honestly I'm not even positive if it's the fault of PBI or Salesforce. My online PBI refreshes in one second with no mention of error, but none of the data is there. So I'd like to blame PBI but on the other hand, I have completely unrelated API-based applications on my desktop like DemandTools, and certain queries (even as simple as usernames) have been nearly choking. So I wonder if Salesforce's load balance is currently poor?