I'm now on my 4th instructor with #5 as a standby (only done a couple of hours with him).
My first instructor I still fly with whenever he is available. This is not much anymore as he has been back and forth to the UK doing his ATPL.
My second and third instructors left the club - one joined a RPT company which would not allow him to do instructing and the other is somewhere in the UK.
I have never had a problem with any of them. The club is very good at putting students with an instructor that suits the students temperament etc.
I SHOULD manage to get through the rest of the PPL with #4.