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If it's a malfunctioning box, it could be pumping out static to fill the bandwidth available - acting exactly like a jammer.

That's a possibility.  I'll do factory reset on the unit and see if it gives me any other issues going forward.  At least I know what's causing the issue and the fix is as easy as unplugging from the switch.

A diagram will be helpful here. 

I've attached a simple sketch - nothing overly complex and no other issues to speak of. 

I follow that HD streaming can definitely cause issues, but in this case there is no streaming going on.  The problem happens simply because this specific Tivo Mini devices is plugged into the network.  It even happens when the device is in standby mode.  Plug it in, all network traffic halts and devices lose credentials within minutes - unplug it and everything reconnects and functions correctly.

I'll look at the settings and research multicast.  I believe this Tivo system functions soley on that feature though.  The overall function of the mini is to stream content from the central DVR box to different displays on the network.  The Mini units do not function on their own.  I would think disabling that would cripple the system, but I will look into it. 

Also, I have 2 of the mini boxes on the network.  The other does not cause issues, which makes me think there could be a problem with the one in question.  I very well may need to simply remove it from the mix totally.  I'm just trying to wrap my brain around how a single device, in standby mode, can cripple an entire network by simply being connected to it. 

I'm having sporadic issues on my home network.  I've found the culprit and can remove the device to solve the issue, however I'm curious as to what exactly causes the issue I'm seeing.

Over the last several months, I've had a handful of random instances where my entire network goes down.  By that I mean that every connected device either loses internet connectivity or loses its network connection (IP address changes from legit DHCP or static address to auto assigned IP). 

The first time this happened it took quite a bit of trial and error to finally narrow down the issue to a Tivo brand streaming device.  I have an OTA Tivo device for viewing and recording over the air TV along with a couple of network devices that can stream stored recordings over the network to different displays in the house.  One of these devices is what causes the issue -

https://tivoidp.tivo.com/tivoCommunitySupport/s/article/TiVo-Mini-Product-Information

When I ID'd the issue I left that device off of the network and all was well again.  Some time later I decided to plug it back in to see if the problem persisted.  At that time, things worked fine.  The device itself functioned and the network as a whole stayed up. 
Some months later, the entire thing crashes again, and the same device seems to be the cause of it all.  Unplug that device and all other devices reconnect.  Plug it back in and usually within minutes, no connectivity.

Obviously my fix is to remove the device, but I'm just curious what can cause an issue like this?