3ware Escalade 6410 array keeps getting degraded

[Gabriel Ambuehl]

Hi,
I have a RAID 5 array on an Escalade 6410 on CURRENT that keeps telling me
it is degraded, then willfully rebuilds using 3DM web management only to be
degraded again a few hours later. Anyone got any idea what's going on
here? It's always the same disk that leaves the array which would
suggest something fishy with that one but then why in hell does it
complete rebuilding successfully?