"On September 20, 2013, NASA abandoned further attempts to contact the craft.[77] According to chief scientist A'Hearn,[78] the reason for the software malfunction was a Y2K-like problem. August 11, 2013, 00:38:49, was 232 tenth-seconds from January 1, 2000, leading to speculation that a system on the craft tracked time in one-tenth second increments since January 1, 2000, and stored it in an unsigned 32-bit integer, which then overflowed at this time, similar to the Year 2038 problem"
https://en.wikipedia.org/wiki/Deep_Impact_(spacecraft)#Conta...
