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Review theOptimization Guides that are relevant for your Internet connection (3G and CDMA-EVDO). Using the Connection Tracker in particular may be very helpful in improving your average Internet uptime.

We do our best to make sure that the Internet uptime is at its maximum, however, when a USB modem's internal chipset causes itself to "crash" during operation, then all of its interfaces with the router will disconnect, and the router will lose its ability to reinitialize contact with the USB modem. At that point, very little can be done from the host machine (router) perspective. The same phenomenon can occur in a computer, and not just a router.

Note: The router will not be able to remedy the issue until a repowering of the router has taken place since the USB port (by USB industrial specification standards) is still feeding power into the modem, regardless of its operational state. Unfortunately, a soft restart won't repower the USB modem that has suspended in operation. Modem "crashes" such as these may seem frequent over a longer period of time when used in a router, but infrequent when used for short casual periods when connected directly into a computer. One recommendation would be to upgrade the USB modem as we have noted improved reliability in many modems following an upgrade.
Our recommendation for this issue is a quick & simple fix: We propose you connect your router to a simple power timer (the kind you would use on your lights at home) to switch off the router a little while at any point of the day. This will ensure a high Internet uptime without much (if any) manual intervention.
Note 2: The DOVADO TINY is the first USB router in the world to include a smart USB port, which will allow the router to re-power the inserted USB modem on its own in the event of a failure. This works if you configure the Connection Tracker to execute a Redial & Restart. Please see the demo video