Channels
If you are having interference or poor performance, it may be due to nearby wireless routers or access points causing the issue.
To see how many other wireless routers and access points are broadcasting, use MtaGeek's free inSSIDer tool
Try to find the cleanest channel among channels 1, 6, and 11. These are the only three channels that do not overlap. If there are no good options among channels 1, 6 and 11, you can try channel 4 or 8. However, selecting these channels can cause degraded throughput speeds if there is a lot of traffic on channel 1, 6, or 11.
It is a trial and error process to find the best channel. The best setting may change at any time depending on all the other wireless routers in the environment
For further assistance, see the wireless manual