@Borje_Lerum 

there's a similar thread about DHCP logs here https://community.tp-link.com/en/business/forum/topic/648832?replyId=1299798&utm_source=Subscription&utm_medium=email

From a quick search , it seems that Telia have a DHCP lease time of 20 mins which would explain why the router is renewing at 10 mins.

My internet provider says I have the same IP all the time and there must be something in my router.

They (your ISP) may allocate the same IP all the time but they are only giving a 20 min lease each time!.

As I understand the WAN IP lease time is nothing I can do about on my (ER605) side,

Correct.

Seems its possible that a recent change in the router firmware may have started to log DHCP renewals where it didnt before...

  @Haga_Nova are those settings available in Standalone mode though ?

My ER605v2  started doing the same.

I only checked because I was having connectivity issues that may or may not be related.   My connectivity issues are resolved for the main part but still some sites I can't get to, but able to ping.

I started getting the message every 5 mins.   For me it started on the 29th Dec according to the logs, which i checked only after I upgraded the firmware to the latest.  The upgrade wast done on 3rd Jan 2024.