Losing WAN every 5 minutes after upgrade to 22.x

Hi all,

I have Linksys WRT32X running 19.07.10. Everything works fine.

I have upgraded to 22.03.2 using factory image and resetting all configuration of course.

After the upgrade I lose WAN every 5 minutes on the clock. It comes back after another 5 minutes and over and over. I suspect this is something to do with DHCP lease.

 daemon.notice netifd: wan (2802): udhcpc: started, v1.35.0
 daemon.notice netifd: wan (2802): udhcpc: broadcasting discover
 daemon.notice netifd: wan (2802): udhcpc: broadcasting select for xxxx, server xxxxx
 daemon.notice netifd: wan (2802): udhcpc: lease of xxxx obtained from xxxx, lease time 2874
 daemon.notice netifd: wan (2802): udhcpc: sending renew to server xxxx
 daemon.notice netifd: wan (2802): udhcpc: lease of xxxx obtained from xxxx, lease time 7200

There is nothing else in the log of any kind.

I can flip back and forward between 19.x and 22.x using fw_setenv boot_part x. Everything works fine on 19.x and 22.x I always get 5 minutes up 5 minutes down.

Restarting interface/networking/forcing udhcpc to renew does nothing. It just doesnt work for 5 minutes.

Any help would be greatly appreciated.
Thanks!