Deco M4 stability issue
Some background to my question:
I recently purchased a Deco M4 set with 2 units. I set it up as an access point network connected to my existing ZyXel VDSL -modem, which has 4 regular wire connections and one wifi router.
The M4 Mesh-network is connected to the said modem with a cable. The first M4 unit include a wifi to which the second unit connects. M4 unit #1 is on the ground level and M4 unit #2 is one stairs up in the attic.
I have connected my Apple TV unit, and my dvd player are located next to the Mesh wifi on unit #1 and my printer is next to unit #2.. Furthermore I have configured my iPads to use the Mesh wifi.
Most of the time all works as it should, but I have encountered one website (to which I connect with the iPads) to which the connection is dropped after an hour or so usage.
My question:
How can I figure out what is wrong with setup? Is there some diagnostics on network usage that is collected and which contain reasons for lost connections?