CRS232 Errors on link

Hello,
I am getting errors on this link a Rocket 5ACPrism
I have tried:
Different Cable
Different Port (on the CRS)
Different Prism
I am getting an Occasional TX Drop on the POE interface. It does not correspond to the ping losses.

Loose ping to the both Prisms
sent=693 received=612 packet-loss=11% min-rtt=0ms avg-rtt=0ms max-rtt=108ms

I am confused…

I have 2 Prism that point North and South Each connect to Nano-beams 16 or 19.
No issues from the north side.

Is it a routing issues? Is it a flat network no VLAN


Bill