Channels of a wireless connection can make a difference but you'd usually see problems with all your internet browsing/etc. Different channels can help improve connection stability problems if you're finding a weak signal in different places in the house or if you tend to have your laptop/PC overly close to other electrical items.

Of course, you may also find that you've left the wireless router on all its default settings and your neighbours are connecting to it at set times of day just to use up bandwidth and ruin your pkr!!