I have no more hair to pull.
I created a connection between Quickbase and Salesforce. There are 2 tables using the same connection. At the beginning, the connection was fine. The first table keeps reading data from Salesforce ok. But, the second table does not refresh, does not update. Reading the history of the connection, here are the different errors that always start with "There was a problem refreshing the table":
The error was: Reading the QuickBase API_DoQuery response from https://...... act=API_DoQuery_failed_WstxlOException
The error was Liberator query thread terminated unexpectedly
The error was The operation getRecords failed: Salesforce error: Failed to send request to https://......salesforce.com/services/Soap/u/29.0/00Dd0000000bUIK
This started to happen out of no reason. No changes, no new fields, nothing. It was perfectly fine. I tested the connection, ok. I requested reauthorization, ok. The first table works well (not fast though) and use the same connection.
Anyone with an idea of whats going on?