I've purchased several Alfa AWUS036AC 802.11ac dual-band wifi USB adapters for use with three Windows 7 computers I have, and I am looking to get better performance out of them. I am connecting them to a TRENDnet TEW-812DRU AC1750 dual-band wireless router. What perplexes me is the variability of signal strength I'm seeing from hour-to-hour and day-to-day, and the fact that rebooting the computer almost always seems to improve the connection. I've also seen the "rtwlanu.sys" cause a BSoD, which makes me suspect the drivers are buggy. For starters, I'm having a hard time finding the most up-to-date drivers for the RTL8812AU chipset used by the AWUS036AC -- strangely, there seems to be no listing for it on Realtek's website. The Alfa website lists only one Windows 7 driver, and it is six months old -- messages to their tech support have gone unanswered. If anyone could point me to the latest driver for download, it would be appreciated. Second, I am curious if there are any settings in the Device Manager entry for the adapter that would improve performance? I would am running them them in the 5GHz 802.11ac mode, both for better speed and to free up the 2.4GHz band for all the other devices that only support that band and aren't as performance-sensitive.