Wifi, excellent signal, no interference but intermittently drops, needs reboot

I have two desktops running on my home wifi system, one is an HP, the other a Dell.
The HP is nearest the router and has full signal strength bars, the Dell is further away and has half bars. I have used the inSSIDer wifi monitoring program to verify that I am using a wifi channel that doesn't have any other strong competing signals on it. I have changed wifi channels anyway to see if the problem changes and it doesn't
The problem: From time to time, as often as once a day, the HP will lose wifi. If I wait a very long time (30 minutes or more) it will return by itself. Normally I reboot to get it back ASAP. It always returns with a reboot and, once rebooted I am good to go until the next day.
This wifi loss occurs only on the HP, the Dell has no trouble on the same network though it gets a much weaker signal. At one time, the HP was on the wifi alone (before I got the Dell) and it has had this problem all along.
Is there some wifi setting on the HP that might be causing this intermittancy? Is there some wifi setting that might regain the signal immediately without the need to reboot. Using "troubleshoot problems" (right click on the wifi icon) cannot regain the signal. Since it happens only about once a day (not at any particular time of day) I am living with it but it is irritating.
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Hi,
You can buy a replacement WIFI card on eBAY for under $10. That might tell you something about the card's reliability and performance.
I suggest that you go back to the original HP driver. If that doesn't change the issue then replace the WIFI card.
The HP part number that you posted, HP p/n 638403-001, is for the RT 5390 and not a 6390. You should correct your information to avoid confusion.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT

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Karen wrote:
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My setup is my TC is being used as a router so it's connected directly to the modem from my ISP. There are a few other devices directly plugged into the TC and a few that use it wirelessly. I've done some troubleshooting and if I connect my computer directly to the ISP modem I have no issues, so I know it must be the TC. Nothing about my setup has changed in over a year and this problem just randomly cropped up. The only thing I can think of is a few weeks ago I reset my router to factory and renamed my network when I got rid of my Airport Express and started using Apple TV. But this issue started even before I set up Apple TV so I don't think it's that.
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