Имею аналогичную проблему с тем же модемом ZTE mf180 - к интернету подключается на пару минут и затем сбрасывается.
lsusb дает - BUS 001 Device 005: ID 19d2:0031 ONDA Comunication S.p.A. ZTE MF636
tail дает
Oct 25 18:05:29 aligm-laptop pppd[3282]: CHAP authentication succeeded
Oct 25 18:05:36 aligm-laptop pppd[3282]: Could not determine remote IP address: defaulting to 10.64.64.64
Oct 25 18:05:36 aligm-laptop pppd[3282]: Cannot determine ethernet address for proxy ARP
Oct 25 18:05:36 aligm-laptop pppd[3282]: local IP address 172.20.201.48
Oct 25 18:05:36 aligm-laptop pppd[3282]: remote IP address 10.64.64.64
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> PPP manager(IP Config Get) reply received.
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <warn> compensating for invalid PPP-provided nameservers
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 4 of 5 (IP4 Configure Get) scheduled...
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 4 of 5 (IP4 Configure Get) started...
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 5 of 5 (IP Configure Commit) scheduled...
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 4 of 5 (IP4 Configure Get) complete.
Oct 25 18:05:36 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 5 of 5 (IP Configure Commit) started...
Oct 25 18:05:37 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): device state change: 7 -> 8 (reason 0)
Oct 25 18:05:37 aligm-laptop NetworkManager[960]: <info> Policy set 'Beeline' (ppp0) as default for IPv4 routing and DNS.
Oct 25 18:05:37 aligm-laptop NetworkManager[960]: <info> Updating /etc/hosts with new system hostname
Oct 25 18:05:38 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) successful, device activated.
Oct 25 18:05:38 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 5 of 5 (IP Configure Commit) complete.
Oct 25 18:05:38 aligm-laptop nm-dispatcher.action: nm_dispatcher_action: Invalid connection: '(null)' / 'connection setting not found' invalid: 1
Oct 25 18:05:38 aligm-laptop nm-dispatcher.action: Script '/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.
Oct 25 18:05:40 aligm-laptop ntpdate[3337]: adjust time server 91.189.94.4 offset 0.120881 sec
После обрыва связи:
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): device state change: 4 -> 6 (reason 0)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 1 of 5 (Device Prepare) complete.
Oct 25 18:07:45 aligm-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (connected -> disconnecting)
Oct 25 18:07:45 aligm-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (disconnecting -> connected)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> disconnect failed: (32) The serial port is not open.
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 1 of 5 (Device Prepare) scheduled...
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 1 of 5 (Device Prepare) started...
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): device state change: 6 -> 4 (reason 0)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> Activation (ttyUSB2) Stage 1 of 5 (Device Prepare) complete.
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <warn> GSM connection failed: (32) Sending command failed: device is not enabled
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): device state change: 4 -> 9 (reason 1)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> Marking connection 'Beeline' invalid.
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <warn> Activation (ttyUSB2) failed.
Oct 25 18:07:45 aligm-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (connected -> disconnecting)
Oct 25 18:07:45 aligm-laptop modem-manager: Modem /org/freedesktop/ModemManager/Modems/1: state changed (disconnecting -> connected)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): device state change: 9 -> 3 (reason 0)
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> (ttyUSB2): deactivating device (reason: 0).
Oct 25 18:07:45 aligm-laptop NetworkManager[960]: <info> disconnect failed: (32) The serial port is not open.
Oct 25 18:07:47 aligm-laptop modem-manager: PS registration state changed: 2
Oct 25 18:07:47 aligm-laptop modem-manager: CS registration state changed: 2
Если есть соображения заранее Thanks!