Unexpected error With refresh: cannot connect tot analysis services server

Since a couple of days pbi reports on the reportserver have issues with refreshing. Its pretty random which report has the issue.. different one Every day.. the reports are not connected to analysis services, which makes it even weirder.. also the reports are there for a long time already. All reports are import reports connected to SQL database and have a daily scheduled refreshp. Maybe a bug in the new powerbi reportserver version?