Vintage
AFAIK there has been at least one mission which suffered an early mission failure in either reaction wheels and/or gyros because the spacecraft was kind of put together in a hurry on a tight budget and ended up using parts that had been sat on a shelf for a few years.Turns out that these high-precision electromechanical assemblies really don't like that. I can't tell you which mission it was - not because I'm sworn to secrecy but because I can't remember!
Anyway, given the haste and tight budget it would not surprise me if something like that was not a contributing factor here, using inventory from the Reaction-Wheels-'R'-Us B-stock parts bin.