Critical bug at Light Build

Hi everybody.
I have two problems in my game with lighting.

I attached an image to let you see what happens after a light build Default Very Low or Default Low settings in Window->Lighting->General GI. You'll see some shadow glitches, and that's our first major problem.

But if you want more, my second problem is that when I use Default High Resolution settings, the build stay at step 5/11 (clustering), and has always 26 jobs to do... even after 48h...

It seems it's not the first time that kind of problem appears : https://issuetracker.unity3d.com/issues/stuck-at-clustering-jobs-when-baking-lightmaps

Our build machine config :

• Processor : Intel Core i5-6400 CPU @ 2.70GHz 2.71GHz
• Ram : 8 Go
• Graphic : GTX 960
• Platform : Windows 64bits

We built on version 5.3.2f1.

Thanks in advance for any answers, for now we can't make a game...

 

Up, it's a real problem :/

 

We finally found the origin of our problem. Our meshes needs to have the "Generate Lightmaps UVs" checked.

But we don't know why baking light in a profile close to high quality take more than one night (in fact I've never seen the end of operation, I was forced to cancel) for a little map on mobile :/

Someone has any advice ?

Thanks.