I had heard mention of some Vapor Flask DNA40 v2.1's giving a "Weak Battery" error even with fully charged batteries, but had not experienced the problem until yesterday.
I knock my Flask over on a table yesterday, only from upright to laying down, but unfortunately it refused to fire after that with the aforementioned "Weak Battery" error.
This evening I took a mini alan key (hex key) that had come with one of my atty's, and as it was a perfect fit for the four bolts on the top of the Flask, I simply ensured each was tighten down.
One of the four was a little lose, and to my surprise this completely fixed this fault!!
You can imagine how happy I am with the result
Just posting in case other Flask owners encounter the same issue
I knock my Flask over on a table yesterday, only from upright to laying down, but unfortunately it refused to fire after that with the aforementioned "Weak Battery" error.
This evening I took a mini alan key (hex key) that had come with one of my atty's, and as it was a perfect fit for the four bolts on the top of the Flask, I simply ensured each was tighten down.
One of the four was a little lose, and to my surprise this completely fixed this fault!!
You can imagine how happy I am with the result

Just posting in case other Flask owners encounter the same issue