I have been a PhD student in an institute for the last 4 years and now my deadline to submit my thesis is in another 40 days. When I joined the institute, official papers were signed stating that Professor X will be my first reviewer and will grade my thesis. By regulation, the first reviewer has to belong to the same faculty, but he was not from our group, and we did not have much contact with each other.
Now that I am ready to submit my thesis, he decides to back out on reasons stating that I was not in touch with him (but I was never told by my supervisor or by him that I need to regularly contact him).
Does this happen and is this allowed since official University papers were signed 4 years ago saying he will be my first reviewer?