Updated:
I changed my WAN connection from Auto to 100 Mps and a funny thing happened with my wireless.
Normally, with a network activity graph, when set to auto, I would get a semi-flat graph (constant download speed) when downloading.
When I changed to forced 100 Mps, my graph was very jagged (like a saw tooth) meaning the downloading was starting and stopping.
I changed back to Auto, and I get a flat graph again.
I think I'll have to leave it on Auto.