Interview opportunities irregularities and tight schedules

I am currently attending the interviews since I am on the bench since long time. Sometimes, I am getting the opportunities without having any breaks. Even if I say the convenient time to me, they say that there are no slots available for that time. Some times they want to join the call immediately without any prior notice it seems. It continues for two or three days. Then after there will not be any calls for a week or two.

I hope this is happening to many of you