We had a vaping meet in November here in Rochester, and I "fixed" several "blown attys" that were simply pushed in too far... it happens all the time... ESPECIALLY when going back and froth from device to device. I have had new attys fail to connect as well... give it a tug and VOILA' all better! The E7 code is telling us the unit isn't seeing that atty there, so theres a good shot that this is the problem
I'm sorry, what tool do you use again? I just blew another week old atty last night. I've got about 4 now at home that I want to see if I could resurrect.