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Camera's are all getting old and Electronics have a life span...
Electronics should have long term reliability, but it seems that mechanical cameras function very well for far longer. My 60 year old Exaktas work fine, even the slow and timed speeds. Same for M3's and F's and F2's.
Perhaps it is because there are so many electronic subsystems in cameras from the 1990's onwards that that increases the chance of failure in any one subsystem. When that happens, typically the camera is unusable.

