I've been getting this since Sunday afternoon/evening. Sometimes when I log in everything will be normal and then the lag spikes get progressively worse as I play. Restarting my router/cable modem/pc/client doesn't seem to have any positive effect on it. Consistently the receive drops down to zero during the spike (which is anywhere between 2-30 seconds).

Other online games, streaming services, downloads, etc work just fine on multiple PCs and devices in my apartment. I tried setting up port fowarding but that didn't seem to have any effect on it either.