LHG 52 AC PTP problems

Hi,

Recently I installed a LHG 52 AC on a PTP link.
Ar first it appeared to be great, with strong signal, high CCQ and RX rates… but the ptp link is behaving very strange since the installation: the traffic goes down with no explanation. And goes back 10 or 20 seconds later. Several times a day.

Nothing on the logs of any equipment;
Around 100 customers using the link behind it, none of them disconnects pppoe;
Ping of the equipment stills up;
No flap on the Ethernet interface;

I’m using regular NV2 protocol with default power settings, default rates, only-N 5500 channel with 20/40 MHz Ce. Just as before with a r52Hn card…

Can someone help me? I’m about to go nuts.