Already Active PPPoE Problem on RB450 w/3.9 & 3.10

We had PC running 3.9 die so we swapped it with a new RB450 running 3.10 which we eventually downgraded to 3.9. Immediately many of our PPPoE customers couldn’t connect. We started getting “Already Active” messages in the logs and they keep connecting and reconnecting but would never establish. Occasionally they would connect but if anything happened, they would go right back to trying to connect again. The problem occurred in both 3.9 and 3.10. Any ideas on how to resolve this?

We switched to a RB532 running 2.9.50 and everything was normal again.

Any idea what is causing this in 3.9 and 3.10 on the RB450?

Paul

(Supout sent to Mikrotik)