for wifi disconnects, try Wireless > Professional and Disable Airtime Fairness for the Wifi Band you have problems with
If problem persists, try Wireless > General > and set Group Key Rotation Interval to zero again for Wifi Band.
Then keep an eye on DSL Log time vs General Log time after you have rebooted router to see if actually DSL is dropping or issue maybe else where?
VPN we can hopefully check after the other issues looked at 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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