Well I'm missing one payout today... They say on twitter that nothing is lost, but why the payout of those 6 hours aren't there ?
Maybe your unpaid balance was below the every-six-hour threshold of 0.04 BTC?
https://www.westhash.com/index.jsp?p=faq#faqs5..and I was really starting to get used to getting nearly twice my daily mining average - every six hours.

Yes, it's been very nice, hasn't it?
As the saying goes: nothing lasts.
Yeah I was smoking hot sunday until yesterday. Still higher then normal today. around 0.021 and 0.011 is normal if you mine in a pool