how I can restore it? I not have backups, only crashed wallet.dat.

Hi. Why the MN rewards is reduced about 9,06 GBX/day? Dut to the current number of MNs? Because the annual reduction is about 8,33% Do you plan to control in some way the addition of new MNs to the network? Is there a limit?

Every time a masternode comes online, the time for your masternode to receive a reward of 7.5 (50% of current blockreward) takes more and more time.
The limit is the Max Coin Supply.

Update your drivers.

Version:   390.65  WHQL
Release Date:   2018.1.8

ccminer.exe -a neoscrypt -o pool:port -u wallet -p c=GBX
This is how your *.bat file should look like.

Is there also a maximum number of masternodes set in the current code?

You write anything that big, it must be true!

There are so many other options for masternode based coins that are POS/MN, if your looking for a coin to stake its not that hard, look around 

Can anyone explain why reward decreased so drastically over the last week or two for most NEOSCRIPT algorithms? Is this related to more people mining these coins/difficulty change or something else as looks a huge drop to be affected just by minners number/difficulty change? A week ago I was able to get 2coins of GBX and now can not get even 1coin.