Hi mate, try this.
Go into your router via 1 of your computers when its connected.
You do this through the browser usually by typing in the i.p address of the router ie 192.168.0.1 Should be this or similar.
Then find the channel options in the router settings. You can force it to use the channel off your choice. Pick a channel from 1-9. A lot of laptops seem to struggle to connect on double digit channels. Also if other wifi networks nearby are on the same channel this can also cause issues, so try pick a unique channel.
My router did this too when using certain android devices. The channel was on 12, they seem to choose at random each time the router is reset.
Hope this helps.
