Unstable Rates on Wireless Link (one side)

Hello guys, hope everyone is doing well.

I have an issue and I don’t know how to fix. I have a PTP link (distance is around 30-35KM) using Netmetal5SHP on both ends.

I have notice on side of the transmission rate is always stable showing 300Mbps-40MHz/2S/SGI constantly and on the other side it’s unstable switching from 300Mbps-40MHz/2S/SGI to 6.5Mbps-20MHz/1S

Anyways I can adjust to maintain stable constant rates, I would really appreciate your help. I’ll attach pictures for support and current configuration.

https://ibb.co/vx0xjV4
https://ibb.co/WfP2xXy
https://ibb.co/hFf1ZKD
https://ibb.co/SnTNYkK
https://ibb.co/CzHxDbW


Thank you much.