Camera is going offline after about 15-20 minutes of working correctly and will come back online after few minutes (time vary, can be 10 or 20 minutes).

Camera is located about 2m from wifi router (working seamlessly all the time), and has full signal strength (when working).

I arleady tried to set DNS server to 8.8.8.8 and also tried to work with router DHCP reserved IP./ Static IP adress in camera settings. nothing helps... 

my router: https://mobilevikings.be/en/setup/modem-internet-box/p3_d25098