Alarm freezing and causing whole phone to freeze in 5.1.1 b830!!! Freaking annoying

Does anybody faces same fkin problem sht ?
This fkin really going on my freaking nerves !!!
Why the fcuk there is problem with alarm ? I just tested it and screen goes black and there is no any sound for alarm and phone half freezes I have to go to settings apps and force close fking clock app
How can I fix this crap ?

Unlocked bootloader b830

Hey guys I had unlcoked bootloader and recovery on 5.1.1 and everything was fine but I did factory reset and after a few times (I had some problems, doesnt matter) I don't have unlocked bootloader now.
cmd says "access is denied"
What can i do ?

B830 is the last version (the ota final version) or beta?

I ask because i didn't take a ota for 3.1 i take a week ago ota update to B623 and i really want to know before i try to force update to B830