Had the dna200 for about a month with zero issue, last night while chain vaping the mod suddenly turn off, batteries are Sony VTc5 around 70%. After plugging the mod into my pc it turned on as if nothing happened. So I thought everything was fine. Woke up this morning mod refuses to turn on, so I plug it back into usb and it's fine. So I take out the batteries and change to my lg hg2s fully charged. The mod again refuses to turn on until I plug it into usb. Wondering if anyone else has had this issue with their dna200 and if there is a fix?