My laptop's wireless connection starts out relatively fast at first, then gradually drops to a slow speed. I get about 7.6 Mbps on my wired connection - very fast considering I am only paying for 6. But when using wireless, speeds can start out as high as 6 Mbps but slow to about 1.5 Mbps about 20 minutes later, and are down to .5 Mbps after 45 minutes. Signal strength is not an issue (80% & up anywhere in my home) and it does the same thing right next to the router. I am not sharing a channel with any other devices.
I replaced the wireless card with a new one twice and also re-installed the driver, but it made no difference. Running the computer in Safe Mode doesn't help. The computer has been updated to Windows 10. I was using Windows 7, but the issue existed before the update (the wiI-fi actually seems to work a bit better in Win 10).
The laptop - an HP DV6t-7000 - previously had wireless speeds just as fast as the wired connection. I currently have several other computers and a ps3 running off of the same U-verse router and all have consistently fast wireless connections, so it's not the router.
I have also tried repairing/resetting the TCP/IP stack, as well as changing various adapter settings but none of that has any effect.