** UPDATE 19-11-2019 17:30 EEST **
Google had an issue which affected connections to the Google Analytics API at random. This affected most Google Analytics API products. The problems were acknowledged and fixed by Google in the past few hours and Supermetrics queries are back to normal.
We are still awaiting word on the exact cause and how it will be prevented in the future on Google's end.
Our apologies for any inconvenience caused by this. If you still experience any further issues with your queries, please contact us at email@example.com
There's an issue with Google Analytics connector causing an error "We are unable to process your query at the moment" when a query is created or refreshed.
It appears that this is a problem with Google's systems. We will update this article as soon as we have more information. Our apologies for the inconvenience.
Report in Google issue tracker: