Chan dongle error

Please i keep getting this error with one of my dongle, how do i resolve it.

chan_dongle.c:445 do_monitor_phone: [dongle0] timedout while waiting ‘OK’ in response to ‘AT’
– [dongle0] Error initializing Dongle
– [dongle0] Dongle has disconnected
– [dongle0] Trying to connect on /dev/ttyUSB2…
– [dongle0] Dongle has connected, initializing…

Hi there,
Have you manage to solve the problem?