Don't worry about that. Got a cousin who got denied twice. On the third time was waiting for the usual denial and got approved. There is almost no reason for the refusal. Don't let it get to you. I think immigration officials may have a sort of quota for the month, week or day. Once reached, they'd start visa refusal. It is just a random thing they do. That's the only way to describe the genuine travellers who got refused the visa.