USD Matrix computer cracking

I've got a US Divers Matrix, one of the Pelagic "hockey puck" computers. Its
probably got 400 dives on it. Low battery yesterday got me taking it out of the
console and while checking/cleaning the battery door/seals I noticed the base of
the clear housing is cracking. It appears that the whole bottom is screwed into
the top. There are cracks along this threaded portion in both directions. There
appears to be a black band below this (seal) and so far no water has gotten into
the unit that I know of. The battery compartment was dry and clean and it
functions fine. If I hadn't looked at it carefully I wouldn't have known it was
there.

Is this a known problem or just a fluke? Anyone get a replacement or upgrade for
a great price from USD? I haven't contacted them yet but plan to.

My wife's Sherwood Resource (same Pelagic manufacturer) died recently. In
contacting Sherwood I was told by the technician there that they have a lifespan
of about 400-500 dives. Hers didn't leak, it just quit working. I don't think it
had cracks. They did an "upgrade" to a newer similar unit for a decent price but
not a jumping for joy price ($175).

Fritz