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I am not quite sure how using SQL Developer could make all client software accessing the network lose their connections. Do you use some kind of VPN (Virtual Private Network) software? Do you always try to use SQL Developer with the non-Oracle KeepAlive plug-in?
Maybe local policy imposes some limit on the total number of simultaneous connections (active or inactive) you can have, and it gets exceeded only when you run SQL Developer. Are any other application clients used to access databases from your machine(s)?
If the real network connection is stable, typically one need only worry about database session time-outs (idle limit reached) or VPN time-outs. I suggest asking for help from someone inside your organization responsible for networks. It seems like something is forcing a VPN disconnect.
SQL Developer Team