Internet shuts off for other devices

[moonshine64 0]

I really need some help here.  Every time I start plex so that it starts up in the system tray my internet gets shut off for all other devices except for the media server.  I've also tested this with other media server programs (media browser) and they seem to have the same problem.  So it's not necessarily a problem with plex, but hopefully someone here knows how to help me.  I'm streaming my plex server from a windows pc laptop to a roku 3 with the plex app.  I'm using a linksys router.  That's probably not enough specifics, but if you need more just ask.  I've been scrounging around a lot and I can't seem to find anyone else with a problem like this.  Maybe I just don't know the right terms to search for though.