#2 - Ranieri's focus shift isn't good
This might be Leicester City's only chance to impress in the Champions League but that should not be affecting their performances in the Premier League. Everyone at the club seems more interested in the Champions League now, including Ranieri.
The players are performing well in the European competition but are not able to replicate the same in the league at all. The manager's magic seems to have faded out or it's just that everyone's found out how they play and found a way to counter it.
Champions League is a very luxurious competition and Leicester City will not be able to get into it anytime soon again. That has made them shift their focus solely on that competition and try to get their magical run in the Champions League, just like their run in the Premier League last season.