Mine wants to be finicky. If it flickers with the 1/4 to 1/2 turn, I take the cap completely off and put it back on. Do the 1/4 to 1/2 turn, then it works. No big deal to me. I'll try the tape and see if I can get it to work better. I'll report back.
I just want to thank you....I forgot about the off switch and for being upfront and honest about the problem.
I parked a chrome 510 echo-e carto on top of this purple beast and vaped my head off. The room started to spin and I had to put it down. I've never used these cartos before (got them today also) and with the Buzz Pro firing them, HOLY COW! I've never seen vapor like this before.
Awesome product even with the glitch. I'm loving it.
Edit: If I unscrew it until I barely see the first thread of the end cap, it won't turn on at all.