I have a ptp link with two non gps epmp1000 radios with the last version ( 3.5.2)
As you can see , there is a time where i have almost 100% of retransmissions , drop of modulation leves for a while and 80% CPU use. all this with a very low of use of the link.
Costumer says that he has experimented ssh drops and annoying voice quality on calls.