Ah, ok. I would suspect that it's partially due to the portfolio...

Ah, ok. I would suspect that it's partially due to the portfolio re-balancing. That will contribute to the div availability as the portfolio constitutions change. Remember, that all these ETFs have their own index rules and the Alternative Beta versions can result in higher portfolio turnover. In addition, divs have been falling across much of the market, particularly in some of the stocks pursued by VHY. This is an artifact of the very simplistic rules based model VHY uses, where there is no screen for dividend stability/sustainability on a forward looking basis. This is one of the reasons I'm not really a fan of it.