OK, I see what you mean now
It could be when that when our shaper kicks into action, there is a momentary drop in throughput, but looks like from your graph that it's for a few minutes, which is not generally the case. I'm also checking on our side to match when changes were made on the system for time logs that might correspond.
Can you PM me a more detailed graph so that I can see if they do correspond? To be fair as well, depending on where you're downloading from, there could also be increased server load hitting at 8am. So we'll need to investigate more thoroughly