There can be both hardware problems and software problems. Artificial minds might suffer as a result of physical damage,* might have divided consciousness** or even multiples.*** The evolution of (change in) a concept on one level in the memory hierarchy might disrupt how other levels of conceptualization operate. Software that is well adapted to one operating environment might not function well in another.
* See my blog of 13 Dec. 2017.
** See my blog of 28 Feb. 2017.
*** See my blog of 13 April 2018.