EXTERNAL_OBJECT_EXCEPTION: Error calling service for action: QUERY, status code: 422, message

Hello All -

Previously I had my Salesforce Connect - Snowflake connection working just fine.

It still authenticates, still validates and syncs successfully, except when I try to query the external object I am now receiving the following error.  

I have tried adding Database and Schema Parameters, DEFAULT_NAMESPACE custom header, etc. but no such luck.   @Ross Belmont

Any hints would be appreciated!

EXTERNAL_OBJECT_EXCEPTION: Error calling service for action: QUERY, status code: 422, message: Unable to run the command. You must specify the warehouse to use by either setting the warehouse field in the body of the request or by setting the DEFAULT_NAMESPACE property for the current user.