WRT54G3G/Vodafone connect card - Network loss after a few hours or sometimes days

I have a Linksys WRT54G3G router with a vodafone mobile connectcard. I did setup the "keep alive" function to the nearest DNS servers to keep the modem alive 24/7. However after a few hours of somtimes after a few days. The modem "hangs" itselves. After a power-up of the modem it's start to work again. This modem is on a project location with no people available to reset the modem. At this moment we use a local timerswitch to reset (power off/on) the modem every 24 hour, but this is not really a solution. We're using the latest firmware. Please advise !

Re ; WRTG3G-ST Disconnect - I am running 2.00.9 firmware with a Sprint S720 card.
The Router disconnects from the Internet after a few minutes of operation. 
I have set 'Auto Connect' to both auto (1000 min)  and manual. and still get the disconnect.
Once it disconnects I cannot reconnect remotely even if I launch a browser or ping.
Pressing the Data Card button does reconnect to the Internet.
Some times it runs for hours.
My 3G signal in this area is not the geatest but I would expect the router to handle that.
Any suggestions on how to keep connected. .

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