I have a report with about 15 web.browsercontents queries among other types of queries. For the last week or so, whenever it refreshes, I get the error "we timed out waiting for web page to load". Which specific query throws the error seems to vary, but it is always one of the web.browsercontents ones. These queries are running through an on-premises data gateway which is fully updated and the data sources show as online within the service.
