This customer service is a joke

This is not the first time I experience this.  I'm at the office and I need to be constantly connected to the Internet (not one minute now and then one minute more one hour later).  In the last couple of days I didn't have any problem, but today I noticed that my Yahoo! Messenger, my Skype, my FTP client, etc. were disconnecting and connecting, disconnecting and connecting every few minutes.  It was a pain even to use the web browser.

Since it's also a bit of a pain to call our ISP's customer service, I waited for two or three hours, hoping that the problem would disappear by itself.  Sometimes in the past, it has indeed disappeared by itself.

But today I ran out of patience and called the customer service.  The guy who answered was very polite, but still made me a bit angry as obviously he didn't know what he was talking about.  But while I was on the phone with him, magically, these disconnections stopped happening.  Yet the guy said he didn't change anything!!!  He suggested that maybe I got a virus or some spyware that was causing this disconnection.  But he didn't even bother asking if it was my computer directly logging on to their network or my wireless router cum modem logging on to their network.  Yeah, he didn't change anything my ass!!!

This is not the first time either that I'm having some problem for several hours, and when I talk to the customer service the problem disappears, but they insist that they haven't changed anything on their side.