R6220 stops routing between WIFI and LAN

Hi,

I using netgear R6220 wifi router. i have connected few devices using LAN: TV, Surveilance, and desktop computer, but computer is avalilable only if UPS is switched on.

TV is configured using DHCP, but Surveilance has set static ip = 10.0.0.125.

DHCP is configured to allow addresses 10.0.0.2 - 10.0.0.50.

router configuration is reseted to factory, and changed only LAN address, and DHCP address pool.

Problem is that, after some time, I cannot ping 10.0.0.125 (surveilance) from WIFI.

After router has been rrestarted and configured, it works for some time, and next morning I try to check surveilance video and ping not work...

I checked Wifi 2.4, and 5G.

I also updated firmwqare to last one.

Do someone know that problem, because I don't know if should I return router for seller or not.

Thanks in advance.

Peter.