That's weird, I seem to have exactly the same as yours hardware 1.04, firmware 3.10....
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One issue I do have is the 510 issue on the RX200 with certain attys...Example, the Vapresso Gemini RTA is the WORST! The 510 pin is way too long. ATTY doesn't sit flush. BUT even if you don't try to get it to sit flush, just snug, issues with TC!
I can't use it for TC, UNLESS I play around with it to get it screwed in and JUST right... WHich means a bit loose! A hair to tight, bounce right out of TC mode into wattage mode!Just like you describe! What you can try is to use a spacer and see if that helps... You can use almost anything, neoprene washer, 22mm x .5mm - 1mm... cut down a plastic cap from a soda/water bottle.....an adjustable 510 heat sink....
Point is, without using a spacer I can't use the Vapresso Gemini RTA on the RX200 for TC reliably at all! On the Cuboid, I can, but it won't screw down all the way to sit flush, but I can screw it down snug....snug on the RX200 equates to no TC! However, with the spacer it works perfect!
So, I am wondering if you are having the same issue, as we both have same mod, hardware and firmware versions.... I'm assuming good 316l wire, spaced coil/s????
BTW, Youtube reviewer DLSJvapes has some charts with device 510 depths, and atty 510 thread and pin lengths that demonstrate how bad the industry is, as far as no standard on the 510 pin length!
Here is the link :
http://bit.ly/1U4woi4
What atomizer are you trying to use???
As far as my issue, the Vapresso Gemini seems to have the longest overall 510 length of any of the documented attys! 5.6MM
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To put that in perspective, the SMOK TFv4, which originally brought this issue to light has an overall length of : 4.84mm
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So, if your atty is listed, and it's overall length is greater than about 4.8(plus or minus .4mm) this COULD be the problem!
If it IS the problem, even using that atty in wattage mode COULD lead to a failure of the 510 on the RX200....