Not getting Payments @

I have been mining on since 3-4 days.
Have minined on multiple times during this period.
Earlier till afternoon yesterday, my ZEC earning were received properly.
But, since evening yesterday, even after mining @ high hash rates.
My wallet shows 0 ZEC.
I did mining twice since yesterday evening.But still the same. no Zcash earning.
Kindly help.
Is there a problem with the site or what is the issue.
Kindly help.