I have Huawei E173u-2 modem. The modem disconnects itself after some 50-60 mins everytime. I checked my bro's, who also has same model, his modem also has same issue ! I tried in Windows 7, Windows XP & Fedora 12, the issue exists. I tried with different network modes [2G/3G] & different operators, the damn issue still there.I updated firmware & tried. Still no luck. It's been more than 6 months, we bought it together from a ebay seller & I doubt he'd RMA it. Thing is I never used more than half an hour since beginning, so I am not even sure whether issue existed since beginning. So what to do ? 🙁