David, as I wrote a few posts back, I get this exact same kind of thing even though I am just at ruby level. When I looked in early January, I could get up to 4 consecutive comped weeknights at some properties, on some weeks during the first half of the year. Fewer nights at other properties on those same weeks. Other weeks, nothing at all at any property. There is just no rhyme or reason to it, they don't send me any notice that free nights are available. It is very time consuming to check all the properties and all the different nights.
And it comes and goes. When I last checked the site about a month ago, again looking forward a few weeks to a few months, nothing showed as comped.
It's like they are daring me to have the patience and endurance to hunt for these offers. I simply don't understand why they don't notify me.
I've been seeing this behavior for about a year now.