For whatever reason I'm getting a lot of shorts with mine. I've tried probably 5 different setups with different juices with the same effect. This happens on both my mech and Provari. I feel like it's not the wick or coil that's doing this. It also doesn't do this all the time. Probably about 20% of the time. I'll start getting a bit of a burnt taste and e1 errors. My current coil is 1.1 but I've tried everywhere from .8 to 1.8. Not sure if it might be the center post.
I've had times where mine will be fine, but then start to taste burnt or have a sudden drop or raise in resistance. The thing to remember is that the positive post is, in essence, a floating post. It is secured by the top thumb screws and bushings. If the mod you are threading it onto has a fixed positive, you may be pushing your center post upwards when threading it on. This can cause one of two things:
1: An upward shift in your positive post causing your coil to pull against the wick
2: a potential loosening of the thumb screws if the mod is being rattled and the post had even a tiny shift.
Whenever I thread it onto a mod, and after I refill it, I just double check all my connections.
On my SVD, I do not have any issues since it has a floating positive. On my mechanical, I have a brass screw that can be adjusted per RBA for solid contact... Occasionally, I adjust it up and forget to readjust it for my RM and the issues noted above will happen.
Keep in mind, this is in no way a design flaw of the RBA. The RBA is solid... Just operator level tweaks that sometimes need to be made.