We saw TemporaryFailure when we had a failed over node at 8:10am. The node recovered and we rebalanced it back in starting at 8:55am.
I would expect to see this while a node failover has not yet been detected. We, however, continued to see this during our outage, even after auto-failover occurred.
We had errors starting at 8:10am, which syncs up with the failover detection (auto-failover also at 8:10) and these continued until 8:56am, which is right around the time the rebalance was initiated.