I'm on the 120 series IP (8 mbps plan) and I'm experiencing erratic behaviour since yesterday. Some sites load fine, others take too much time. Gmail, of all places, was very slow to load yesterday but not today. Downloading attachments from Gmail today was erratic. 20kB/s on the first try, 850 kB/s on the 2nd. My netbanking refuses to load after log in. Weird.
Also, I get the same behaviour on the Speedtest. Download leg after payload transfer doesn't end and keeps on dropping, so I just quit.