True that any component can fail, but a quality product has likely had stress testing and failure analysis performed. Possibly even beta testing in user environments. The box we are discussing here was most likely rushed into production as soon as the prototype was operational. Their philosophy seemed to be that as long as it worked in a controlled lab environment, it was good to go.
It isn't just hardware, the device in question may very well been unable to adapt by searching and using a less crowded wifi channel, not properly handling an acknowledgement handshake or some other software protocol error that fell apart in the real world.