Matt, I read your modem's data and it doesn't say it is dual band meaning it isn't (most common).
http://www.2wire.com/pages/pdfs/5100-000383-000_2W_Rev_B_0107.pdf
It also looks dated since it isn't 802.11n. My Cisco Linksys E2500 is only a wireless router while 3800hgv-b is a gateway (has modem inside). I had similar 2-wire modem before and started having internet dropouts (perhaps age - old caps). Decided on separate modem and router. Modem I use (Motorola 3360) works like charm (no dropout ever) but had poor reviews since previous versions were overheating (this version has better airflow). The reason for Motorola is support from my provider - AT&T that lists this model. Setting Modem-Router can be a little tricky and should be done the way they recommend it but it is easy if you follow steps. Linksys has other versions like for instance E2700. You need to find out what you need (USB ports etc.). It isn't high power wireless, so if you need distance over walls something else might be better (or use repeater). Mine is pretty much in the same room (loft). Hope it can help you. I'm not a computer wiz but I know who is - Almarg, in case you need help. He also has better overview of the situation and can recommend if you need the change.
http://www.2wire.com/pages/pdfs/5100-000383-000_2W_Rev_B_0107.pdf
It also looks dated since it isn't 802.11n. My Cisco Linksys E2500 is only a wireless router while 3800hgv-b is a gateway (has modem inside). I had similar 2-wire modem before and started having internet dropouts (perhaps age - old caps). Decided on separate modem and router. Modem I use (Motorola 3360) works like charm (no dropout ever) but had poor reviews since previous versions were overheating (this version has better airflow). The reason for Motorola is support from my provider - AT&T that lists this model. Setting Modem-Router can be a little tricky and should be done the way they recommend it but it is easy if you follow steps. Linksys has other versions like for instance E2700. You need to find out what you need (USB ports etc.). It isn't high power wireless, so if you need distance over walls something else might be better (or use repeater). Mine is pretty much in the same room (loft). Hope it can help you. I'm not a computer wiz but I know who is - Almarg, in case you need help. He also has better overview of the situation and can recommend if you need the change.