I was able to carry out a search and according to the manual, this is exactly how it should be done. According to the manual: Click on Router. Then enter the following information before clicking on Apply: IP address: Enter the new IP address of your router. Subnet mask: Enter the subnet mask IP address DHCP server: Activate the DHCP server DHCP IP pool: Enter the start and end IP address for your DHCP. DHCP time: Enter the maximum lease time in hours. Unfortunately, it is not written why DHCP should not be adjustable. In this case, I would recommend contacting the manufacturer directly. I am also releasing the question again, as someone may have this router and would like to share their experience with us.

Hi, I had the same problem - as far as I can remember I set PIN Status to disable somewhere under PIN Management and then I no longer had the problem.

Thank you very much for pointing this out, I will be happy to pass it on to the relevant department.

That happens to me only when network is very very weak (sunrise in the mountains). Otherwise ok.

I had 6 connected

Thanks for pointing this out, I have just removed the incorrect information. This is a 4G router.