SFOS 18.5.2 MR2-Build380 pppoe problems

hello

our current sfos is SFOS 18.5.1 MR-1-Build326, and we have 3 WAN [PPPoE (DSL)] , everything works perfect and all WANs connected successfully.

But I downloaded SFOS 18.5.2 MR2-Build380 update (from id.sophos.com) and upgrade manually, when new firmware applied , all WAN interfaces (PPPoE) keeps connecting without successful connected with logs in log viewer:

Port11 : PADI Packet sent from interface
Port11 : Discovery Process Completed
Port11: Authentication Fail. Please check Username & Password

and I never change username and passwords.

so I had to roll back to  SFOS 18.5.1 MR-1-Build326, and everything works again.

any ideas?

thanks