Hi @Novak_Ondrej!
Are you referring to the simulation called “REF_prot15_bezocasu_AC”? If so then the convergence looks promosing but you have to increase your maximum runtime in the simulation control - the mesh looks “perfect” 
Attached some pictures for future simulations that can help you identify the problems easier.
\underline{\textbf{1. Where to find the problem?}}
You can click on the run (1) and then on the “message icon” (2).
We can see it tells us there is something wrong with the runtime.
\underline{\textbf{2. Where to increase the runtime?}}
You can type in a very big number (for instance 300,000) just to make sure your simulation does not stop in the first place or use the Run continuation which can be found in this post: Platform Update 12/2018
Cheers,
Jousef