Proxy Server goes out to lunch

I have NT 4.0 server, 15 clients using W/98, cable modem connection. Have service pasks up to 6a, Proxy server ver 2.0.389. Once or twice a day Proxy Server stops and no one can get internet access without restarting all services in the proxy console. Can’t find or determine from those that I do find, any logs that indicate when and why it goes down. I could live with this if the serveer notified me that proxy had gone to lunch?

Also, any time I try to run the built in internet usage reportsfrom the SBS console, I get an error message:
“-2147467259
[Microsoft][ODBC Text Driver] The Microsoft Jet database engine cannot open the file “(unknown)”. It is already opened exclusively by another user, or you need permission to view its data”

My boss wants to see these reports ?