Complex sentence: In service, the static RAM proved to be problematic, it was discovered that the square root code contained a bug that resulted in 1 in 60 million calculations being wrong, and one of their four CPUs was not running reliably.
Split into simpler sentences: In service, the static RAM proved to be problematic. It was also discovered that the square root code contained a bug that resulted in 1 in 60 million calculations being wrong, and one of their four CPUs was not running reliably.