Tor close control connections

When I'm using ARM for Tor, and close it (via menu -> exit or q) it seems to leave the connection open. It seems so, because when I reopen it, I see the following line in the log:

11:14:30 [NOTICE] New control connection opened. [3 duplicates hidden]


They disappear when I reload Tor but this seems kinda wrong. Is there a way to configure ARM to close the connection on quitting or make Tor auto-close connection after some time?