My home internet runs through a Sprint mobile broadband card attached to a Cradlepoint CTR350 router. For a few weeks now, it has been behaving oddly - after about 5-10 minutes of being connected (whether I load pages or not), the connection just dies. It's still connected to the router (with good signal strength), but all Internet connections time out, and the wireless activity indicator stays black. For some reason, XP's "repair connection" wizard fixes it, but then it just quits again after another 5 minutes. When it is working, pages load quickly, so I don't think it's having a problem connecting to Sprint. I also don't think it's a problem with my laptop, as another (desktop) computer has recently started having this problem too. The xbox connected by ethernet has never had this issue, though.
Does anyone have any idea why this would happen?
Edit: Now that I use Linux, I discovered that the problem is almost certainly related to DHCP. The connection to the router always works, but sending DHCP requests usually times out. It's not sporadic, either; when it starts failing it doesn't recover without unplugging the router and plugging it back in. This provides further evidence that it's not a problem with the Sprint card, but rather a design flaw in the router itself.
Unfortunately, the seemingly random timing of the failures makes testing difficult -- when I make a change, it's a while before I can know if it truly worked. I'm looking at the following settings for potential solutions: (I'll post results if one of them works)
- Connect Mode = 3G Only (in Modem -> Settings)
- Global Reset Settings (in Modem -> Settings)
- Update Method = Manual (in Modem -> GPS)
- Disable Failover (in Advanced -> Failover)