EX6120 (FW 1.0.0.48) loses connection with router all the time

Hi, I recently updated  EX6120 to the latest firmware version 1.0.0.48.

The problem I'm constantly facing is that the extender loses connectivity to the main router.

when it loses connection to my gadgets the green light both are steady. No matter what, within the next 3 or 4 hours the NETGEAR EX6120 seems to lose the connectivity to the main router and it will take about 10min+ to self-recover.sometimes it doesnt get back the network hence i had to restart it .

This seems to happen more frequently if there are more devices connected to it,

At times when the NETGEAR is down, 

Any recommendations to fix this? 

Anwar