Stage 2 wont start

I’m running a homebrew machine with grbl and stage 1 will start and cut a million times. I try stage 2 and after 10 minutes of generating toolpaths, the screen becomes active again, and the carve button is blue, then turns back to green like I never pressed it. It’s done this in the past, and if I try again, it usually goes. this time no deal. If I try to do the whole cut with the detail bit, it will do the same thing. The cut is pretty extensive, wondering if website activity would make this happen, or something else, like too long data stream. I have cut this file numerous times in the past… PS my cable is good. Thanks.