I've had an '05 US STi for 3 years with about 37,000 realatively easy
miles on it. So far I have replaced the rear strut mounts twice (at
Subaru's expense, of course). The first time they replaced both rear
struts, too.

It's making that noise again that suggests I have another broken strut
mount back there.  

Dies anyone know if this is a known weakness in the car's design, or
am I just having bad luck?

Has anyone in the group had the same problem?

Is there anything else in the suspension that I should have them check
which might be out of alignment or broken that could be causing the
rear stut mounts to fail repeatedly?

Thanks for your comments!

Philip