WAX610 keeps disconnecting.

I have a wired network in my single story property.

I have an R8000 router because there is a fair amount of steel in the house connectivity is always been poor

I tried the mesh extender but never noticed any improvement in quality at all.

I purchased a wireless access point (WAX610), powered and connected to the router via a GS308E.

Connected great.

and works great... but every 5 minutes the device goes offline and and I receive an insight mail... a few minutes later it is back online and I receive another mail to that effect... and devices cannot rely on it.

the router never goes off... My PC is attached to the same switch and never loses connectivity.

If the network access point is powered and wired, connecting via switch to a router that both never lose connectivity - why does it keep cutting out?