Navigate via Network Center to the adapter advanced settings:
There are a number of settings, they differ from adapter to adapter, but check:
- 802.11 channels both 2.4 and 5.2 set to 'auto'
- 802.11n mode: 'enabled'
- Wireless Mode: '802.11a/b/g'
- Prefered band: 'No preference'
Hope there is one setting which helps,
Henk