Failure of fine detail pass

Please help, I’m running a two stage carve. The rough pass works fine, but the fine detail pass takes a long time to calculate and then quickly flashes the tool bit paths. Then they disappear and the carve button turn green and then nothing happens. Could it be my internet connection? It seems like the detail path calculations are quicker near my router than in the garage. I’m trying to avoid a 25 foot USB cable…Thanks!