From reading this thread, it seems that it is likely that a certain batch or lot of the computers (or most likely one or more components inside) are faulty. It seems that the older ones are fine, as shown by many responses to the effect that "mine has worked fine for years" but maybe more recent (within the last 12-18 months) have the problem.
As an electronics engineer, I can see where a bad batch of parts which could have been incorporated into a few, but not necessarily all, computers could be the cause. Not all, because the typical (I don't know about Suunto's) manufacturing line is only manufacturing some, not all of the models at any one time. Then the next model/group of models is processed. This allows for some efficiencies in processing and testing, rather than having to set up the lines for different models every hour or day or week. This is assuming they don't have enough volume to maintain a manufacturing line for every product simultaneously and continuously throughout the models life span.
So, if a bad batch/lot of parts (sensors) did come in, all models manufactured over all time would not be affected. Only that model/models that were currently in the phase of production such that the defective parts were incorporated (assembly) would be potentially affected.
Without a study of when the individual models of all their computers were manufactured, preferably by lot designation, the failures may appear random.
Also, as Hoosier has stated, it is the Prime Manufacturers responsibility to ensure Quality. This can be done many different ways by visiting the subcontractors (in China or wherever) manufacturing plan and witnessing the acceptance testing, by doing their own extensive testing at their Receiving Inspection point, and many variations in between. But, whatever method they use, it is their sole responsibility (to the ultimate customer) to ensure the quality of the product. The customer does not have privity of contract with each or any of the part vendors. That means that we as customers cannot go directly to that vendor for action, since they have no legal or contractual responsibility to us. That responsibility is between Suunto and the vendor.
None of the above excuses the indifference and lack of support Suunto is providing their customers. No matter whos fault it is, it lies solely on Suunto to please the customer, and make things right. I dont think Ill be buying any Suunto computers in the near future, until they start caring about the customer, and not just making a buck (or euro).