Sometimes when I log into RoundCube I get a error that says:
SERVICE CURRENTLY NOT AVAILABLE!
Error No. [0x01F4]
However, when I click the reload button, then RoundCube loads the Inbox. What is happening that shows this error?
Could be a multitude of things. Typically this is when something goes wrong with the database (dropped connection, bad query, invalid access credentials, etc.). You could turn logging up and look in the error log for hints.