LAN - LAN Network randomly losing connection

May 3, 2018
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Hi, I've got a router in my garage downstairs and it has to stay there in order for me to get Ethernet in other room, but because of this my WiFi upstairs is not great.

I have 2 Vodafone HG659's and when I connect them in LAN - LAN
(DHCP OFF, different IP's, same WiFi channels which are pretty unused by neighbors)
My main router in the garage randomly stops displaying the WiFi light and loses internet connection. The speed are perfect but yeah just loses connection.

Without the second router connected I get no connection drops just the WiFi speed upstairs is bad.

What am I doing wrong? or Is there any other way to get better WiFi speeds upstairs using this second router i have?

Thanks