I cannot recall what page but I recall reading about this in one of the posts from mid to late last year.
It can damage the sensor or the oven to have it run for too long without air flow. If it is cutting off after 3 seconds as intended then I think you are ok but, yeah, I definitely wouldn't want to be firing it back to back like that with any regularity!
I had a few more bowls over the course of yesterday through today and am getting a feel for it. I started from a 100% charge and after 4 cups am on 2 out of 5 lights for battery, which seems way lower than others but this was ths first charge and based on earlier comments it gets better after a few charges... we'll see! Either way this unit will be going back for a replacement that doesn't look used.
I am on true love's path with this device, though. The pure ease and convenience cannot be understated! One of my favorite aspects is that even after going at level 4 (will try 5 this weekend with some oil on top) I can pretty much immediately pop the stem out and handle the cup with my bare fingers. Yeah it feels hot but nowhere near an uncomfortable burning hot. Less tools or accessories needed on the fly if having to rush.
Not that it offers a lot of protection, but i found a good use for my leather treasure bag I got with another purchase and I love it. Perfect fit and zero ambient smell when stored with a fresh cup in the stem.