I have a Dell XPS13 laptop and it developed this really annoying habit of randomly freezing for a few seconds and then carrying on as if nothing had happened. It quite often happened in the middle of a work call which made it pretty much unusable.
I have worked with various flavours of “Agile” over numerous years. These have ranged from the very formal where everything is done by the book to more ad-hoc versions where different parts are cherry picked or in most cases done because people think they should be done.