I have a point to point link CPE - WISP AP, It disconnects frequently.. What does these logs mean. note that most of the time it disconnect from CPE side. usually too many ether1 link down. ether1 is connected to another CPE mode RB through POE adapters, (2 POE adapters connected together).

The below is the logs of CPE
And WISP AP

You may have two problems there. I would start by troubleshooting the Ethernet problem first and get that fixed. If you have a bad routerboard, replacing it may solve both your problems (wired and wireless).