WiFi: See the packets? And they are! But why aren't there? wait what...?

Question

Ping

Difficulty of the question: VERY DIFFICULT

CLICK HERE this spoiler, but a lot of traffic (pictures)

See the ping? Not! And he is...

но минутку с другого ракурса уже нет??????? КАК?
Что я имею:
Осн. роутер - wr1042nd и два дополнительных как дочка доступа wr841 (13.8/14.1) П.С. Они все через витую пару соединены...
10.0.0.0/8
10.100.100.1 - телефон WiFi Motorola Moto G (Да на нем интернет есть, да уровень сигнала 98%)

Занес я 10.100.100.1 в ARP осн. роутер, пингую - никак, перезагружаю роутер пинг с телефона появился, а на долго ли? сначала у меня и без этого работало, я видел камеру через локальную сеть.

То что скажет?
Систематику не нашёл, в начале работает, а через энное время уже нет. От чего зависит я не знаю.

Что этак, что так порт всегда показывает что открыт был всегда, ну кроме когда телефон выключен.
ТЕЛЕФОН ВСЕГДА РАБОТАЕТ, ЭКРАН НЕ ТУХНЕТ - что бы сразу никто не подумал про телефон...

There is a wifi phone, the Internet works on it "ok". But after a while, I don’t ping him on the local network (but he has the Internet), as a result, the server that is running on it does not work ... WHY!??????
I also need to say that the computer sees the phone, almost always but not always xD
// Screenshots were taken in the morning, just
UPDATE: I didn’t notice, I rebooted the router and thought that I had enabled ARP on it, but no. After rebooting the main router, the ping started, now I turned it on and I will watch it ... (THIS DOES NOT MEAN THE PROBLEM IS SOLVED :()
UPDATE: There is only one DHCP server!

DHCP screen

Answer 1

Most likely the problem is solved by the ARP method, but this is not accurate and I'm not sure.
Problem with WiFi point and low-quality module at the WiFi consumer
quality = cost

Answer 2

=)
I'll start right away with the most fantastic hypothesis, because it's the most fun.
the second DHCP in a network? Look who distributed addresses when everything is good and when everything is bad.
but so that the route has changed and returns the answer to the ping in the wrong direction.

Answer 3

I recommend bringing all networks to the same format / class, then you can draw routes

Answer 4

Is power saving turned off on your phone?
Is there something like Wifi in sleep mode in the Wifi settings on the phone?
In your mobile network settings, check something like always transferring data.