3 months post-op hair transplant - tiny skin tissue balls with hair shafts are falling out. Is it going wrong?

If you are having issues after surgery, it is best to contact your doctor.  If your doctor is not returning your calls that would be a worse concern.  What you are describing does not sound typical.  Find another doctor to see if you cannot get a hold of your doctor.

There may be 2 issues going on, either shock loss or transplanted hair is falling out later with scabs. If you had a tremendous amount of scabs and did not wash it appropriately it may be coming off at this point. Or may be experiencing shock loss. Nevertheless, if I were you I would keep trying to contact your surgeon, or find another doctor who can assist you. I hope this helps!
 

After 3 months you should now be seeing early signs of growth. If you are seeing shedding of grafts at this point it is possible that you have not been washing your scalp thoroughly. I would suggest a follow up appointment with your hair restoration surgeon.