I have some questions about Wi-Fi. I've had Xfinity since I moved to Baltimore last August and it has typically worked very well. We pay for 400 mbps down, but I understand that the speed of your internet is limited by what device you're using it on. Over the last 3-4 days, our internet has flat out sucked. Online games lag, streaming services are slow or fail to work (we struggled to watch the game Monday night and ended up watching it on cellular service), and sometimes, even simple web pages like the 8th load slowly. Xfinity came out and looked at everything, replaced some cords and tightened some things, but the improvements have been minimal. I think the next step is for them to replace the modem. Either way, here are my questions: 1. Some of my friends suggest that with Xfinity, we should have two "band" options (2.4 & 5 GHz). I know my aunt and uncle had Xfinity in Nashville and, despite paying for slower speeds, had the 2 band options. When I asked the Xfinity tech, he told me that both are built into my single network, and each individual device connects to whichever one is best for it. That sounded like bull shit to me, so I figured I'd ask here. 2. What speeds should I be expecting when I pay for 400 down? We live in an apartment building, which seems like it cause slower speeds from the beginning, due to the amount of people living in a smaller area. We use a number of devices, including multiple iPhones, our laptops (PCs), smart TV's, google homes, and my Xbox One X. I've run the speed test on most of them, and rarely do I see the speed even top 200 like it did when we first moved in. 3. How important is upload speed compared to download speed? What activities is it most important for? 4. Is there a more accurate way to test my Wi-Fi speed than Xfinity's speed test web page? It seems wildly inconsistent, but is that normal? I ran the test 3 times in a row, back to back to back a short while ago and got 110 down, 176 down, and 63 down. Is it normal for the numbers to jump around that much? 5. Are there other steps that can be taken beyond replacing the modem? Will replacing it do anything to help? I just want to have the consistently fast internet I enjoyed for the first 8 months here again. I appreciate any feedback any knowledgeable people are able to offer!