i have a new gds3710.
it works fine. but ist is just reachable for a few hours. then it does not make calls,
no door bell,
no respond on a sip call,
no ssh connect.
the only living sign is that the blue keyboard led lights on button push.
if i remove and reattach power, it works normal for a few hours.
i tried firmware .8 .11 and .14
what are you connecting it to?
What SIP server the GDS registered to ? Do you have any SYSLOG (wireshark trace even better)?
Please open a support ticket at Grandstream Help Desk.