My screwdriver MK2 started acting up after I got some 510 atomizers and used the supplied 901-510 adapter. Intermittent functioning, mid-puff cutout, etc. Me and pops tested the battery and the SD connector and found em both to be fine. So culprit was the adapter.Sooooo... took the center post from a madvapes 510 gold small hole connector, swapped that with the silver one in the connector and boom, good to go again. So if anyones having problems try swapping out the center posts on 510. Worked for me, and seems to work better now!!
