Finally got my full node synced the other day. Checked 'allow incoming connections' and within about an hour my internet went to nothing.. kicked from game server, can't load pages, it was terrible. I checked the node and it only had 16 or so connections, nothing bad.
I then remembered this happened about a year ago when I was using a RPI for a node with a different ISP. I thought the ISP was bad so switched. Now I'm thinking this is an automated DDOS where datacenter routers can handle it, but not home routers.
My previous setup: RPI 256mb, BT Infinity 80mb/40mb
Current setup: Pine64 2GB, Virgin Media 70mb/5mb