Zenith - DTT900 Digital-to-Analog Converter Box Review

I purchased the Zenith DTT-900 DTV Converter Box from Radio Shack in May 2008.  It performed well until March 2009 when it began turning itself off after a few minutes of operation.  After resetting it, confirming the auto-off function wasn't the problem I determined the problem was heat related.  The box has been installed with plenty of air flow and unobstructed vents so I believe the issue is quality related.  I've installed several Zenith boxes, several RCA boxes, and one GE box. This is the first Zenith failure (the GE box also failed the same way in a totally different location and installation).

I called Zenith for warranty replacement. The DTT-900 has 90 days Labor and 1 year Parts Warranty from date of purchase.  The description states that Zenith will pay shipping return to the consumer.  I was informed that I would have to pay $35 Labor for repair of the unit plus shipping to Zenith.  Discussion with the Zenith representative proved futile. 

Since I am not interesed in paying more than half the original cost of a device that only lasts 10 months I'll not purchase anymore Zenith DTV Converter boxes for future installations. I'm hoping my other Zenith DTV converter installations don't fail.