The CPU utilization graph starts with a date that is 1899.
Configuration is corrupt.
You may have the wrong Windows connection associated (linked) to the SQL Server connection in Connection Manager. Make sure the correct server is entered.
You can also may need to delete and recreate the connection.
Recreating connections won’t lose any history data as long as the connection names stay the same.
Note, there will be a data gap during the connections become unavailable.