The same happens to me. I opened a post last week but I had few answers...
I need to rebbot the firewall too as all traffic stop and the screen 
show this message: "watchdog timeout".
Is that what happens to you?

Hope someone will give us some clear answers.

Hi.

Dominic Wijnolst ha scritto:
> Hi,
>
>  
>
> Just lately I'm experiencing that m0n0wall 1.3b2  sometimes (once a day or
> so), stops all internet traffic.
>
> If I reboot the m0n0wall box everything works again (the box does not crash,
> I can still use the webgui).
>
>  
>
> The problem is not at the ISP's side because I also can't reach my modem
> when this happens. There's nothing unusual in the firewall log.
>
> Is this a bug?
>
>  
>
> Dominic.
>
>  
>
>  
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>