routerOS bugs

I wish to inform you of these bugs in this versions of the routerOS: (RB450G)

  1. When you access PPPoE Scan after displays MAC addresses available, drop the PPPoE connection and then reconnects but stay connected than 0/1 second and then disconnects and reconnects again.
    From this loop connection - disconnection can not get out except by restarting the entire router. This bug appears to version v5.23 and v5.24 version and the version v6.0rc11.

  2. V6.0rc11 only version: I have a PPPoE connection with NAT and DHCP.
    After a while , DHCP is no longer offering computer DNS addresses obtained through PPPoE and thus internet does not work.

  3. version v5.23 and 6.0rc11 (I think and in v5.24): virtual interfaces not appear in the interfaces menu after restart .
    to recur have to create one and then appear all.

Can anyone help me with this bugs?
Thanks