I recommend that you rename the SSID to something more unique.
Use InSSIDer application to see hows around you and find a open and clear channel, 11, 6 or 1 is preferred.
Use modes only that are being used and supported by all of your devices. If you don't use A, B or G modes, then use single mode N only. WPA2/AES only is preferred security mode. Try Auto TPIK/AES if needed.
You'll have to check back with the Mfr of the InSSIDer program for AC support. I was told that it's not supported as of yet.
Good Luck.