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About every 15 minutes this evening for about 1 minute at a time - disconnecting both Wi-Fi and Ethernet connected devices. The problem seems worse on weekends and Sundays especially. I've not stopped having problems with Vodafone, can't wait to see the back of them.
check your router logs and have a look to see if the logs keep saying WLAN disable and then re-enable
are you sure it's Wi-Fi and Ethernet and not your sync that's dropping