I do not recall reading about any specific, recurring problems with either LionChief or LionChief Plus sets. The only problems I have read so far are generic problems affecting all model lines.
The only "wish" that most Lionel hobbyists have is to be able to upgrade the LionChief/Plus locomotives to full TMCC/Legacy control so these locos can be run on a full command layout without using 2 remotes.
Larry