After I upgraded tot the latest 6.31 version and installed it, I get in the logs every 30 second an entry: excessive broadcast / loop message op the modem port (port 1) on the RB2011UAS. I never had this before! Nothing was changed (physically).
Although my other two Mikrotik (RB912UAG-5HPnD) and RB951-2n were also upgraded, and they do not show any problems.
I must say that everything works, internet and the VPN are up.
Please everyone create supout files on your routers with latest version (where we could see these Log messages) and send these files to support@mikrotik.com