Since morning, DHCPv4 server does not seem to be working anymore on the Speedport device. I can see "(DH001)  DHCPv6 is active" messages in the system logs. The last "(H001) DHCP is active" message was seen over 24 hours ago.

I have tried the following:

1. Restart the Speedport router multiple times.
2. Deactivate and reactivate DHCP via  https://speedport.ip/html/content/network/dhcp.html  (with and without restarts).
3. Tried using  https://www.telekom.de/hilfe/hilfe-bei-stoerungen  but it says it cannot perform the diagnostics.

The wireless mesh seems to be flakey as well. It seems that the nodes are not receiving IPv4 addresses (as expected when DHCPv4 is not working) and then trying to reconnect.

Other relevant notes.

• Firmware version is  010142.3.9.001.0 .
• WAN is fiber optic.
• There are several static address allocations tied to MAC addresses on the LAN.
• There are no switches or routers upstream to the router.
• There is one PoE switch downstream to the router.
• The only way I can connect over WiFi right now with a v4 address is using a static IPv4 config.

As a last resort I am going to reset the router, hopefully that someone who fixes the issue. If anyone has ideas around what to do here or know of any similar issues reported before, much appreciated.