I have this with my Cube too, but not with print files from Cube software. I noticed this first after i first used the option to set different temps for first and other layers in Kisslicer 1.4, the head just stopped for full minute or so. However, filament was not being extruded, so there was no blob (apart from the slow oozing). With Kisslicer 1.5b, the pause is way shorter, only few seconds. So it's just the system waiting for the target temp for the nozzle, apparently. AFAIK, Cuber firmware functionality.