Everything that isn't connected via ethernet cable will eventually drop connection after being connected for a while. When it drops it says connected no internet. Only way to fix it is to disable wifi and enable it back. Happens on both my smart phone and my laptop. Any help is appreciated.
This often points to wireless router fault --- used to happen with me, WiFi dropping out almost every day, ethernet unaffected. I replaced the 3-year old Netgear router with a more expensive Billion model and never had any more WiFi dropouts.
Might pay you to borrow a router for testing purposes(a good one mind) to see if that fixes the issue.