HELP | Baking is bugged.... Dark spots appear and baking time is too short

Hello im working on a simple 3D game and I bake the Lighting quite regularly to update all objects and lights ive added. Until now everything worked fine but then dark spots appear and my computer suprisingly bakes in less than 10mn (used to take more than 1 hour). Ive tried deleting the lightmap and restarting but same result. Is it because my computer doesnt have enough RAM or cache (i dont really know what it could really be, im a poor laptop user, maybe its software). Here is a screenshot :

Hi @TheArchitect7

This problem occurs due to filtering. The bug is fixed in latest 2017.3 (which is 2017.4 now) and 2018.1 though. Let us know if the issue still persists after upgrading.

Thanks