Havent received any payours for sha256 for a couple weeks now looks like a huge scam!
The sha contracts produce a number of Bitcoin per day and some of it is used to pay for electricity. Due to the huge increase of difficulty in the last couple of months the Bitcoin payouts are not enough to pay for the electricity.
https://bitcoinwisdom.com/bitcoin/difficultyI assume your contract is not paying anymore because payouts are lower than electricity cost ("maintenance fee").