Gateway intermittently blinks yellow then green and lose Wi-Fi

I have a Xfinity Gateway that intermittently blinks yellow then green then seems to reboot itself every couple of hours.

From reading the past posts here I understand that this might have something to do with the signal strength so I took the snapshot from the admin page below.

I have tried to reboot the gateway, remove any splitter and check the integrity of the cable line. Nothing seemed to help.