POS it's some kind of mining as POW. Difficulty and block rate depends from number of wallets online and unlocked and also depends from luck as usual.
Possible many users turn off wallets and another part don't have coins for minting.
Also we have several forks now and many users can't resync to right chain. ( I have to remove and redownload chain several times untel get to 5600 block). Also large part of users still not update wallets.