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 ?