If you're a corporation and find yourself budgeting for union avoidance - give that budget out as raises instead and you may buy yourself more time in the long run!
You may or may not have a mechanism to limit bandwidth on the whole connection. It could be at the router level or possibly an option on your network card configuration. If you have the capability, setting a limit at 90% of your bandwidth should leave enough room to minimize the issues you're seeing.
