I approaching my qualifying exams, and what I am going to present for it (what I have been working on for the past 2 years) might be heading towards a dead end.  So that would mean I might have to start something new (I have 2 more years left under my scholarship, and what I have done so far is not very substantial).  Which would  mean that my final thesis might be very different from my QE.  How common is this amongst PhD student here?

I have heard stories from seniors where they had to change topics because they had to change supervisors, due to problems with them.  But l would like to hear your stories,  if you have such stories,  or is majority of PhDs so smooth sailing?  Haha. 

Btw I am a new member here and found this forum looking for answers to my PhD extensive crisis. Hope to make some new friends here!