Debian Configuration :: Unable To Reconnect 3G Connection After New IP Was Given

I use Debian Jessie 8.2 and I am using a 3G connection using this modem => [URL] ....

The 3G connection works fine, except after 24 hours the connection drops and I cannot reconnect. If I reboot the computer, the connection will work again.

My guess is that my ISP gives me a new IP address after 24 hours and somehow my system cannot handle it.

How can I reconnect my 3G connection without rebooting?

I have already tried the following commands:

Code: Select allsudo service network-manager restart

Code: Select alldhclient -r eth0
dhclient eth0

Code: Select allsystemctl restart ModemManager

Results of journalctl and grepping my connection name (SFR)

Code: Select allsept. 22 17:58:19 ark1 NetworkManager[512]: <info> Policy set 'SFR Web / Prepaid 1' (eth0) as default for IPv4 routing and DNS.
sept. 23 18:17:07 ark1 NetworkManager[9446]: <info> new connection /etc/NetworkManager/system-connections/SFR Web * Prepaid 1
sept. 23 18:17:08 ark1 NetworkManager[9446]: <info> Auto-activating connection 'SFR Web / Prepaid 1'.

[Code] ....

As you can see sept 22 at time 17:58 is when the computer started up. And roughly 24 hours after it failed to reconnect.

Also I should mention that there is a script to run the command:

Code: Select allsudo service network-manager restart

if the computer cannot ping a server, ie if the connection is lost.

More journalctl info when the system tries to reconnect:

Code: Select allsept. 23 23:52:53 ark1 NetworkManager[9446]: <info> Auto-activating connection 'SFR'.
sept. 23 23:52:53 ark1 NetworkManager[9446]: <info> Activation (ttyUSB0) starting connection 'SFR'
sept. 23 23:52:53 ark1 NetworkManager[9446]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled...
sept. 23 23:52:53 ark1 NetworkManager[9446]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started...

[Code] ....