Whatever I do node is always offline and can not send bitcoins.
I check logs and no errors.
And this is really annoying because it happends everytime I send some bitcoins it starts to makes troubles.
Any help will be appreciated.
I don't have any experience using this wallet before but I tried to search on the forum and I found this
Armory - Node Offline FIXEDSOLUTION!
Re installed Bitcoin Core v0.15.1. Opened it and checked the debug. Left it running and restarted armory after selecting Rebuild and Rescan Databases. It worked and took a bit longer to load. Hope this helps a fellow newb someday.
According to him reinstalling Bitcoin Core and select rebuild and rescan databases in the armory solved this issue. So try to do his method it might solve your issue.
The quoted above is old post so I think you need to find the latest Bitcoin Core to reinstall your core you can find it from here
https://bitcointalk.org/index.php?topic=5034070.0