any hints how to solve my problem?

@Sunshine Even after the update, the DHCP problem still seems to be present. What could be the reason?

@Sunshine Hi, my FW version is 1.2.0.0.9.1 v0001.0 Build 200511 Rel. 44954n. I think the router is otherwise good, but the DHCP server must run reliably and stable.

@Sunshine my clients all use a private mac address that doesn't change, so from my point of view it can't be the clients. This same MAC address is also correctly recognized by the router, but the IP...

Can someone help here where i can find the privat MAC Adress setup?

@Sunshine where can i set if i want to use privat or random MAC? I thought that if I assign an Ip address to a MAC address on the DHCP server (reservation), this would also work.