Colibri failures?

I bought a Colibri data logger in June 2003 and have enjoyed using it
with SeeYou to go over my flights (no badge or record work for me). But
the unit failed in March 2004 with a "Seal Not Valid" message, which
was fixed by returning it to the manufacturer. The unit recently failed
in the same mode again. I suspect I just got a lemon or have bad luck,
but before repairing it again or asking for a replacement, I thought it
wise to check if anyone else has had similar experience. Many thanks.

Martin