Why when I'm playing toribash automatically restart?

what do you mean? while making replays?

I also experience this. It is when you play single player or even multiplayer, at the end of the last frame it automatically makes a newgame or like auto-spacing if in multiplayer.

Unfortunately, this is a bug in the game that hasn't been fixed yet.
The best thing you can do if this bug has affected you is to go to Options, and tick 'Autosave replays' on so you don't lose any of your work.
This bug is currently being worked on, so don't worry too much about it.