The change at Leicester is........treacherous. For me, the way in which Ranieri's departure 'sank without trace' within the media is even more bemusing. City took weeks of heat for the Mark Hughes departure including the apparently 'fake news' that Mancini was at the ground and I recall the media going nuts about how Hughes was treated. In Ranieri's case the stories about the contact between the players and the owners got very little publicity and the duplicity of some key movers (Schmeichel; Vardy etc) was ignored.
From what I have been able to glean the players seemed to dislike changes instituted by Ranieri including training routines, diet, & team selection policy.........and I think the players stitched their former manager up because they didn't like the changes. Shakespeare promised them more of awhat they liked from the sweet trolley so they ditched the mean headmaster. It doesn't take much to lose in the PL especially if you are playing at the max to maintain the standard. Drop that work rate 5%, just fail to track someone once, fail to make the fully committed tackle which you had done before in the title winning season......and 'boom' - your opponents take advantage.