Interesting, you got a different version of the tail cap protection, here is mine :
That smaller screw, while inline with where the thermal sensor is located underneath, does not actually connect to the thermal sensor.
Update 20161107:
Olight sent me a set of replacement cells for the X7 and with them the light functions perfectly. Tested it with my new 30Q and it worked great. Popped in the new cells from Olight and it worked great. Popped in the original cells that came with it and it won’t stay in Turbo S. Definitely an issue with the cells and not the light itself. Per Olight’s request I am shipping the old cells back to Olight for testing.
Thanks a lot for the update. This was bugging me for some time now; I just want to know what the problem was… Such a shame for Olight, as they try to make life easier for many customers by offering off the shelf cells (ok, and making some profit as well), but it all backfired…