Our company network has been dropping its connection to the Internet every 1 - 2 hours for 20 - 120 seconds for the past 72 hours. Our ISP is Windstream. We have seven bonded T1s. I can ping the public gateway continuously all day and I can see that we lose our connection for about 10 to 14 pings or about one minute per occurrence. When it goes offline, normal users do not notice because it comes back quickly. However, our VPN users are kicked offline and cannot work. Large file transfers and back ups are also interrupted. We use a SonicWALL NSA 2400. I have no errors in the log and I have rebooted it. Windstream is about to blame this on internal equipment because they cannot see any problems remotely.
What is the solution?
Should I start immediate ISP shopping?
Has anyone seen anything like this before?