I would suggest posting in this TN42 thread. It gets more traffic. Thrunite TN 42 ,a new record in Throw _
With that said. I am sure you want to know what is causing that. Good news is your light works and ALL you need to do is take the batteries out until your ready to use the light.
Taking the batteries out reminds me of a SEPARATE AND DIFFERENT issue that I have HAD w/ my high powered lights for several years.
Condensation under the lens!
Solution:Silica gel packets in the battery tube and w/ the batteries which are stored in a big pill bottle until they are ready for use. It rarely happens anymore. if it does I just put in a fresh silica gel packet and refresh the other one in the microwave! I have had these packets for over 2 years.
BTW ALL those lights are modified by Vinh[V54] W/ The exception of the OSTS TN31mb which Michael Johnson Modified. Mine was the last one he did[470Kcd]. 
All others were b/w 390/420Kcd.A new XPG2 S2 bin had come out and I benefited from it! This was in December of 2013.
