According to the block explorer at petro.gob.ve, the petro miner must be going offline a lot.  Block 403 from today was mined 24.8 hours after block 402 from yesterday.  There is another 17 hour gap between block 400 on Friday and 401 on Saturday.  I'm just guessing, but maybe they don't allow decentralized mining and someone is DOSing their only miners.  Does anyone know how many miners they have?  I see sometimes they get 4 blocks in a row with average 10 minute gaps, but then it stalls again.