SonicWall TZ205 keeps disconnecting

Just recently my sonicwall started disconnecting from the internet and i can't find what is causing it. The SonicWall has a static IP and is connected to an AT&T modem. I have called AT&T and they say all is good up to their modem. The SonicWall disconnects then shows the amber light on the wrench icon. When we restart the SonicWall router it connects to the internet and runs find for about 15 minutes then crashes and needs to be restarted.

When I look at the log it has a bunch of firewall notices about and "Unhandled link-local or multicast IPv6 packet dropped." To me it sounds like a virus but can't be sure. How can I troubleshoot this issue? Where to start?

Thank you
TimSr. System AdminAsked:
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bbaoIT ConsultantCommented:
how old is your SonicWALL device? it looks like something is wrong with the firmware, and you better reset the firmware by booting with the default settings.

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TimSr. System AdminAuthor Commented:
I believe that the firmware is the issue however I am unable to upload any new firmware because the upload keeps failing. I will keep trying to update the firmware but I think that might be the cause of the problem. Of course when I was at the site that was having the problem the issue resolved it self.
bbaoIT ConsultantCommented:
> I am unable to upload any new firmware because the upload keeps failing

what browser were you using to upload the firmware? and the version?

some old SonicWALL firmware only works well with old versions of IE, it could make things tricky.
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