Athena loses connection to SalesForce from time to time

[nicolasbock]

The monitor loses connection to SalesForce after some time and does not recover.
The error message in the monitor log is something similar to:

athena-monitor      | 2023/10/16 13:05:40 [simpleforce] request failed, 401
athena-monitor      | 2023/10/16 13:05:40 [simpleforce] Failed resp.body:  [{"message":"Session expired or invalid","errorCode":"INVALID_SESSION_ID"}]
athena-monitor      | 2023/10/16 13:05:40 [simpleforce] HTTP GET request failed: https://canonical.my.salesforce.com/services/data/v43.0/query?q=SELECT%20Id%2CCaseNumber%2CAccountId%20FROM%20Case%20WHERE%20CaseNumber%20LIKE%20%27%2500371350%25%27
athena-monitor      | {"level":"error","msg":"[simpleforce] Error. http code: 401 Error Message:  Session expired or invalid Error Code: INVALID_SESSION_ID","time":"2023-10-16T13:05:40Z"}