I had a similar problem with mine.
I got the install disk (latest one) here;
http://amiga.resource.cx/exp/search.pl?amiga=1200&cat=scsiI installed in novice mode and it worked, been fine ever since!
As a side note, it only ever works automatically if you install in novice mode, in my experience of the squirrel.
I hope this helps...
:-D
