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!

Most people are from the UK and our PhD has a different structure to the one you describe, so I'm not sure if we can be of much help