I have similar issues with a Huawei E272 modem. After some time it disconnects, and I have to unplug and plug the modem again in order to connect again.
Disconnection occurs much less often and also reconnection is possible without replugging the modem if there is some keep-alive network traffic trough the modem. So I usually run the following command in a terminal in the background: $ ping -i9 www.some-server-that-responds.com This generates some minimal network traffic every 9 seconds, and that is enough for some time to keep the connection alive. However, random disconnections do still occur. The modem seems to be hidden from the system for a second, as if it were plugged out and in again (but no such thing happens). Syslog excerpt attached. ** Attachment added: "syslog contents during disconnection" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/746078/+attachment/2213279/+files/modem_disconnects_syslog_excerpt.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/746078 Title: USB modem disconnects after a random time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/746078/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
