I have had a lot of trouble starting cka mock exams for days

I have used two different computers with safari, chrome and firefox but the labs won´t start or when they do start, some questions won´t load and the lab environment will be very slow. My internet connection is very fast so that is not the problem. It has been like this for about a week now and the only reason why I pay for kodekloud is to be able to do Vijins and Mumshads CKA mock exams. I have reported the issue several times but I haven´t gotten any reponses and nothing has improved. This is terrible