Hi Ben,
I've answered this question a number of times, so I'll just forward a
copy of my general answer rather than re-write every time:
Hi!
We had a Hitachi machine -- I think a 102 -- and found that after 3
months it would no longer raise the bread dough. We wrote in to this
excellent newsgroup, and soon found out that many owners of Hitachis of
various ages, were having the same problem; so we took our machine back
to Costco to exchange it. When we got there, we found that Costco had
had a large number of returns on these machines. All were for the rising
problem.
Anyway, it seems likely that your machine is doing the notorious Hitachi
cool-down. They must know about this problem by now, so you might get
good results by contacting them.
Good luck and good bread to you!
Janet