regarding point to point link in Net metal 921

Please help me for netmetal 921 point to point link
I have installed 9211 two radios as point to point link with Ubiquiti 30 Dbi antenna
the link is working fine with 52 dbm signal but yesterday onwards the link goes to 71 dbm signal

chain 1 shows 71/71
chain 0 shows 95/95
on both side please help me for link solution that is there radio prob or antenna problem