P10 BH 20 link problem

I need to stabilize a link of 31.4kms with BH20 p10, it works at 600rssi and after 2 days it came erratic with falls every 5 mins.
We tried to realign the antennas without success and now we lost it complete.
This link is over the ocean with a 200 mts high both ends according with link estimator no freznel zone problems, I read that P10 have some issues with long links.
any help will great

an RSSI of 600 is pretty low…what DB level and jitter are you seeing? Is it 5.2,5.7 or 2.4? are you using dishes? We need a little more info.