Perhaps sensing his imminent replacement, Marvin went into a temporary coma this morning for 45 minutes and refused to start.
After a serious talking-to and a short reset moment, Marvin reluctantly awoke and is, for the moment, functioning as usual. (All latest versions of important files have been backed up and the crematorium is on standby.)
In return for his continued clinging to life, I have agreed not to mention IT (a.k.a. The Replacement) for the rest of the week. He drives a hard bargain.