Network connection to server disconnects constantly

[monton]

We have a problem with the connection to our server. The server disconnects randomly from minutes to hours all day. I am at a remote location and connect via logmein to a local pc at the servers physical location to remotely control and connect to the server. A month or so ago the connection would drop every few minutes. The staff at that location replaced the switch and had the ISP tech check out the router. No problems were found. I think it is a problem with the server itself but don't know what it could be. Typically I can go through the login process and reconnect. I'm sorry I can't be more specific about the equipment since it is 40 miles away. Any suggestions on troubleshooting? Remotely?
Clearly I'm not a network guy.
Thanks for any help or direction

 

[DelJo63]

The usual suspects are:

1. (for DSL connections only) missing or faulty line filters
2. need to update the router/modem firmware at your end
3. packet reassembly overflow(a)

(a) very techie, but the solution is easy; see this description