Please, take a look at https://luckpool.net/hush/blocks.html, They are still mining block just fine and check out our new explorer at https://explorer.hush.is/.

And the suspended payments are because people are still trying to mine to transparent addresses which is messing with their system.

The reason you might be having sync problems with your SD wallet is because there are still many old nodes on the network which have stopped receiving blocks at 340 000 Block height so they are messing with the wallet.
We will be rolling out a fix for it soon