There is an option in FW's menu bar, Tools -> Options > System Tray, to shut down immediately & not minimise to the Tray. Not sure if this is the issue.
I don't have my FW set to start at system startup, no issues connecting.
I use File_Girl's version of FW. Her version does not auto-update & I click no to updates. AFAIK the only so-called improvements they've been making are in reference to their silly Android system, no actual program improvements.