Well, even people with multiple exit re -entry visas can not take vacation when ever they want. It has to be approved too. And if the work load is too heavy, they will be asked to stay. nothing unusual with that. Plus, usually people with families, children etc. are favoured...as they can only go if the kids are on holiday.
Plus, asking for vacation a few day before one wants to go during a popular holiday usually does not work.

and why would your sponsor be suspicious about you not coming back?