I started noticing this a few months ago after loading the July firmware update. Every day or so I get a tremendous transmission spike. I can't find a matching correlation to any device on the network, and it's not be recorded by my internet provider Comcast. Any idea what's causing this and how I can fix it? Someone else on Reddit had an identical problem but there were just a few snarky responses and no resolution. AC68U with Merlin 386.12 firmware.