got lots of ConnectionStatusChanged events

[eddylai]

after open the port and waiting communication data arrival,
the ConnectionStatusChanged events arriving every 2 to 3 minutes
(args.Connected changed to false, then true)
but I didn't put any close() in my code, what's the possible cause of this problem?

(build and run on Ubuntu 14.04 Server, using /dev/ttyS1 )