Lights baking process is long.

Lights baking process is long.

Hi Samuel,
I have an issue with light baking process.
I have done full baking (around 10000 tasks)  before and it took about 30 minutes only.
This time I have about 26000 tasks and baking process runs already about 14h.
I use main computer and few more as a helper. I opened the project on them and pressed "Start Bake Worker".
The process runs pretty fast and then stacks in the middle and shows that "Client connected"/"Client  disconnected".

Today morning one of the computers showed that window

What can be a problem?

Thank you.