Wireless can have a number of issues.
I recommend people use it with more control.. ie if you take away all the auto and make it fixed speeds and channels you can see it better.
So start with new names.. I suggest SMB standard.. short no spaces pure alphanumeric.
Give a different name to 5ghz.
Set the radio channels.. for 2.4ghz that is 1, 6, 11 (13 in ETSI).. as the only non-overlapping.
Try each in turn.
5ghz you can also try although the range is so poor it usually doesn't have the same level of issues.
Use WPA2 Personal security.. password of 12-20.. less or more depending on your Paranoia. pure alphanumeric mix upper lower case and digits.
If necessary change the wireless to slower speed but that is very last step.
Run a wireless test software on a laptop like istumbler for Mac or inssider for PC. See how the wireless signal is around the house and how much interference you have.