You seem to be underestimating the current difficulty value, 5ph is just close to nothing, it has a chance of 1 in 41,396 at every block, should difficulty remain flat (which it won't), it should take on average 287 days for 5PH to hit a block, so not hitting a block with 5ph that ran for 1 or 2 days is just pretty normal, you should be surprised if it DID hit a block.