For as long as anyone can remember there have been connection problems with wifi routers, whether running the original firmware, Tomato, or any other 3rd party alternatives. I manage several very large apartment blocks with a combined no. of residents with internet access in the region of 3000. The turnover rate of residents is quite high, so I've had probably had at least 10,000 users on these systems. I've seen a great many people who complain about connectivity problems, even when an AP is right outside their room. I've had hundreds of USB sticks, laptops, and PC's to look at. I can now draw some conclusions. The biggest problem is simply that many of the wireless devices do not connect to the strongest AP, even if there is a choice available. Some of them seem to take great delight in connection to the absolute worst, weakest AP they can find. Even if connected to a strong AP, for no particular reason they will disconnect and start hunting around for an AP. Wow, sometimes they find the one they just disconnected from. Bingo! But sometimes - even if you only have one AP (router) it may just ignore it for several minutes. There are so many of these devices around, and so many chipsets in Notebooks, Laptops, and whatever ... that I am not going to make a list. Usually changing driver versions to the latest, or reverting to earlier ones, makes no difference at all. A lemon is still a lemon. IMHO, the performance of the wireless in many of today's laptops, notebooks, and now tablets - is getting worse, not better, and the drivers are a mess, with too many bells and whistles added to the "N" specification and which are fundamentally half-baked or broken. The solution is very simple. In EVERY case of a client having problems, substitution of his wireless (be it USB or the laptop's built-in wireless) with a known reliable USB adapter from TP-Link immediately cured the problem. EVERY client that has co-operated and tried it, has had service restored. Those that refused to try it - well - they've got really bad tempers now, still fighting the world and losing. Life can be tough ... You don't need the most expensive adapter. Wireless G is adequate for most people. "N" often gives more problems than it's worth and is useless for large buildings. The very cheap USB adapters from Tenda have been extremely reliable. The W541U "G" and W311U "N" adapters have never given a problem with any of my routers. TP-Link "G" adapters seem to be about the same, one of them has an external antenna and runs higher power, really good for weak spots. Increasing the router's power to 150mW and using one of these 400mW USB sticks can make a dramatic improvement in connectivity. These adapters have never, ever, given the slightest hiccup. http://www.tenda.cn/tendacn/Product/show.aspx?productid=337 Tenda W541U V2.0 Wireless USB Adapter ( Ralink RT2070L Chipset) http://www.tenda.cn/tendacn/Product/show.aspx?productid=340 Tenda W311U Wireless USB Adapter ( Ralink RT3070 Chipset) http://www.tp-link.com/en/products/prodetail.aspx?mid=010303010303&id=2615 Atheros Communications, Inc. TP-Link TL-WN422G v2 802.11g [Atheros AR9271] You'll notice these are Chinese ... credit where credit is due! Clients whose laptops didn't work reliably at their university, hotspots, coffee shops, report that the situation was mostly resolved (and they are very angry at the makers of their beloved laptops, and no longer pray to them each night before going to sleep). Other problems - a wireless card that has auto power enabled, i.e. those which can go into "sleep" mode, all best disabled. Power is ALWAYS best set to maximum. TURN OFF ANY POWER SAVING MODE! Many cards don't have any configuration setup, so nothing you can do. Quite a few have configurable settings for roaming aggressivenes, etc ... problem is that they don't actually seem to do anything. Why many laptops have useless wireless I have no idea. Intel cards are the pits. If you have one, and want to use it at N speeds, don't forget that WMM must be enabled at both ends. XP is not so good at wireless connection. That's not usually a problem because not so many people still use an obsolete operating system these days. And the answer is to upgrade. Vista is ... well I won't mention Vista unless there's a priest nearby. But Windows 7 is extremely stable and runs on most hardware - even most older hardware. I do hope this information is useful to someone. Too often the router is taking the flak for this, and it's unnecessary. A quick addition - any remaining disconnections are often traceable to an unwanted mobile phone or other POS with poor firmware trying to connect to your system. Just the act of trying to associate can cause you problems and you will never even know what is causing it. Chinese "ripoffs" of popular phones are the worst offenders.