V-Flyer

I've been tracking some MPM fares for a two week trip in Aug. Good fares were available for at least 10 consecutive days and on all flights on each day. Today, none are available at all. I therefore have two questions that am hoping someone can help with:

Why have these dissappeared? I'd like to know so that I don't miss out in the future.

In your experience, is there any chance of for MPM seats being opened up at a later date?

Thanks in advance!