I am reminded of an experience I had many years ago with a piece of industrial control equipment. Every few weeks (usually in the middle of the night!) it would throw off a really large analog reading for one program scan. It turned out that the vendor of the ADC chip had changed the spec so that one more wait state was needed somewhere in reading the value - otherwise you would sometimes lose the sign bit. Since the analog readout was in two’s complement, if you took a value just below the zero midpoint and removed the sign bit, you got a number that was quite near full scale. But just for one reading. The vendor of the equipment eventually figured it out and made a firmware change, fixing the problem.
Ken