Hi, i have a situation. I have Mikrotik RBSXT Lite5 as a router. And sometimes my LAN just stop working. When i disable/enable ethernet (LAN) its start working again. i dont get it. It happens multiple time in the day. In the atached file you can see what i have in the log. Can dhcp warning (in the log) be the problem? And what does it mean? Thank you.

Where do you get IP address from? From DHCP of your MikroTik or is it from some other router or server?
Yes DHCP server is set on Mikrotik. Posted log is from the same Mikrotik.