How to swap WAN interfaces of RouterOS correctly?

Question

Mikrotik

Hello colleagues and sympathizers, there is a server with RouterOS installed with two WAN interfaces, one unfortunately on the built-in network card, the other on a quite decent, smart card. The built-in one began to behave badly (it might just turn off and not start before the reboot), the backup works out at 100%. I'm tired of fighting in the reasons for its shutdown, I sin on iron (if you tell me where to dig, I will be immensely grateful).
There was an idea to change their places, and I understand that the matter is not limited to a simple renaming. Is there any manual specifically for physical servers, for Mikrotik devices it is full, but the logic is slightly different and the methods are not suitable.
Thanks in advance.
PS I forgot to add, DHCP is only on the backup channel

Answer 1

I'm tired of fighting in the reasons for its shutdown, I sin on iron (if you tell me where to dig, I will be immensely grateful).

Dig towards CHR. It is not worth keeping ROS on bare metal in 2020.