I'm trying to think if there's a word for a failure to keep up-to-date. For example, the British NHS's recent well-documented failure to maintain Windows XP, or a professional's failure to maintain Continuing Professional Development.
E.g.
"I'm not sure that your [delinquency] is our problem."
'Delinquency' may in fact be the best word, but I had in my mind something more akin to reprobation - I just can't quite put my finger on it, if indeed there is an 'it' to begin with.
Any thoughts?