Whenever my PC connects to my network (as in wakes from sleep and starts sending packets) two of my three Decos go offline. 

Here's a diagram of my network topology:

The PC connecting knocks out Satellite 1 and 2. 

Some additional facts:

• Everything on my network is using DHCP. I have no static IPs assigned.
• The AT&T BGW320 is properly configured for IP Passthrough. 
• I have two ethernet NICs in the PC. It doesn't matter which one is connected, it knocks the Satellites offline.
• This problem did not exist on my network when using mesh products from another provider, and the topology has not changed. 

What could be causing this?