The issue it seems that due to a bad block (670), the big hashrate suddenly stopped, causing diff retarget algorithm problem. The diff retarget algorithm is the same as in all other pow/pos coins (except for Galaxycoin where it has its own diff retarget algorithm). The exact diff retarget algo problem is still needs to be investigated. But apparently it occurs at a very rare situation. So we did twice block re-adjustments to bring the diff back to track. Everything seems OK now.

The reason why a bad block occurred at 670 is not clear, but it seems the same as in Cosmoscoin. It's probably a rare condition that caused the algorithm to fail.

We will watch closely, and if any problem found we will fix it. Please understand that diff retarget algorithm is common for most of the pow/pos coins, so I would not particilarly worry about it for now.