Ubuntu – My WiFi connection frequently stops working (no internet, not disconnecting)

My internet connection frequently stops working (I can't open any websites, ping does not work, online games disconnect, etc.) but my WiFi is still connected. I've only installed Ubuntu a few days ago, so I might just have noticed the problem now. I've also checked, that my other devices have a working internet connection, so I'm sure the problem isn't with my router.

output of the wireless info script

EDIT:

• the problem occurs more than once per hour

• disconnecting from and reconnecting to WiFi temporarily fixes the problem

• rebooting the router does not fix the problem

• other devices are unaffected
• turning off power management does not fix the problem
• lshw output
• The problem does not occur on Windows(dual-boot)
• fixing the routers WiFi channel does not fix the problem