Q: Wifi keeps dropping out

I've noticed recently my wifi seems to drop every 5-10 minutes.

I don't see any signs, no exclamation marks etc. I just find web pages take a long time to load, I go into the Network Preferences > Assist Me > Diagnostics and via that I see a yellow mark next to various areas (it changes but it's usually 2 or 3 of either the ISP, Wifi or Server).  If I hit continue and go through the process on in the diagnostics section it re connects to my wifi and works again for the 10 minutes or so.

I don't find this happening on my other devices.

Is there any way I can find out why it's dropping so often?

Software  OS X 10.9.4