I have followed this show from day 1 .Most of you are saying that first 3 months had each and every actor in single frame. The main reason for that was Nidhi was in kotnis with only 3 main characters of nidhi ,ashu,mallika and to certain extent anjie but nowadays there are many ranga,anjie,ashu,nidhi,her family,mallika,suhasni,rohan and armaan all have almost same level of importance because of the script
In first 3 months most ASHNI scene were in kotnis only i,e MB had just to shoot in some hospital location and then his home/baba ka makkan .Nowadays Ashu has to be in hospital(for mallu), his home (for armaan),some unplanned date (for nidhi) and for KK it is just her family and ashu and nowadays hospital shoot. So blaming him solely for not giving time would be wrong on our part.See i know KK has max screen time but it is mostly with her family and rohan (at one shoot location only) whereas MB to be in each and every frame with the mentioned ppl will have to shoot at 3 different places or set , We dont know what has happened between KK and MB and we never will get know about it. CV is at fault as u must have seen many serials are there in which leads don't get along but still they shoot together and as far as i know both KK and MB are professional enough to keep their differences apart for this show plus i feel MB is one of the genuine ppl in television industry and bollywood as he speaks his heart out.
Also if leads had any sort of tiff the media would certainly have pointed it out.
sorry for the long post but these were my observations and reasoning