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Weird Wireless Issue

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Setup:
I have a basic home network which runs using a D-Link AC1200 ADSL2+ Wireless Modem Router. Because of the design of the house and available telephone sockets, I have to run both of my desktops using a USB network adapter for each computer (cannot permanently use an ethernet cable for either).

Issue:
When using newer, Wireless AC compliant adapters, the internet connection keeps dropping off and is slower. When using an old Wireless N adapter, the connection is stable and faster than the newer adapters.

Have Tried:
- have tried two different modem routers Netgear AC1600 and D-link AC1200 (both purchased within the last 3 years)
- have tried 3 different network adapters (1 about five years old, works best, and other two less than 2 years old)

I have NOT been shaped. Network is secure, WPA2 with LONG key - nobody is accessing my network that I'm aware of. Connection is fine with an ethernet cable, but I cannot use it permanently.

If the old N adapter works fine in the same spot, why aren't the AC ones also working properly?

Any ideas what the problem is or what I am maybe overlooking?
 
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How many other networks are within range of your network?
 
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How many other networks are within range of your network?

My wireless adapter is showing about 9 OTHER available wireless networks.

ETA: Signal for the 5GHZ WIRELESS SSID is poor and keeps dropping off when I enable it, therefore I have disabled it and only use the standard 2.4ghz which seems to run better.
 
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2.4 has better range

Try getting a USB extension cord and placing the adapter higher
 
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Are you able to disable the legacy clients? like b/g???
 
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I decided to use two Wireless N adapters and my connection has been stable since, but still not as fast as I'd like.

Are you able to disable the legacy clients? like b/g???

Hi, I just did that and can notice the speed is a little quicker, thanks for the suggestion.
 
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No problem
 
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