I am receiving PoS rewards daily and I don't have a large amount of SGL right now.There is no problem in PoS system.You just have to keep your wallet open and be sure it is shows ''staking''.
it is not really true. I have several inputs with more than 1000 confirmations, older than 24 hours and wallet still reporting: NO MATURE COINS FOUND. STAKING PAUSED.
so I am getting the feeling that POS is only for "selected" users with a special config file because in the basic (wallet installation + receiving coins) is not enough for getting POS working on this SIGIL wallet! And devs did not give us any config file, any other needs for enabling POS (min amount of coins in the wallet, min count of confirmations, min age) nothing...