The staking confuses me, though to be far I don't have much experience with staking coins in general. I've been running my wallet for about 12hrs a day when I'm online, the same 12 hrs each day, the first week I was getting coins every other day without fail and now for the past week I haven't received any. It just says expected time to reward 2 days or 3 days or 1 day. I'm assuming I'm just missing the time when they're being distributed? So the staking rewards happen at random times and you have to leave it on 24/7?
Someone correct me if this is wrong, but Sirius doesn't 'charge' your coins, i.e. your staking weight doesn't increase the longer you are staking unsuccessfully. This is why it is more of a lottery to stake. The expected time to stake is often not helpful as the network weight also changes when other nodes go offline. Staking 24/7 is therefore the preferred method with this coin. Also, the staking rewards seem to be split in half and you need to keep staking aprox 2 days to secure them.
You do not need to be staking to receive your second installment of the stake. Once you stake a block you get 2.5 Sirx the other 2.5 Sirx are awarded to you 500 blocks later whether you are staking or not.