Thanks for the links and explanation.
I looked more detailed into my MN payments, I have an average of 6,2 days between payments in last 2 months, but last one was 8 days and now I'm waiting more than 10 days still w/o new transaction.
I guess that it's bad statistics/luck

Probably just bad luck. Try not to press "Start-Alias" or "Start-All" in the wallet as it will make your ENABLED masternode to go PRE_ENABLED and be restarted.
It will send a new masternode ping to the network and will be put at the end of the payment cycle. Also make sure you have the sentinel v1.1.0 installed from our github.