I have a number of devices connected to my wireless network, but after a few hours they all suddenly lose the ability to reach each other. They can still access the router itself and they still have internet access but they're unable to see each other, no ping responses from each other or anything. If i restart the router everything goes back to normal and they can all see and connect to each other as they should but eventually after a few hours they suddenly stop seeing each other again until the next restart.

There is nothing in the logs to suggest anything is causing it and no errors or anything, and I can't imagine what settings would cause it to work completely fine for a random number of hours before failing like this. Any ideas?