Ok, I use Aspire ET S tanks with BDC coils on an MVP 2.0. For some odd reason, I'll be vaping along just fine, and then..............almost nothing. Not that I'm a cloud kinda guy, but a little vapor would be nice. Then without any rhyme or reason the cloud will come back. This will happen a couple of times throughout the day. I'm not changing any voltage or wattage settings. Any ideas? This also happens to my my wife as well, using the same setup.