I have the GGTS for some months and I am a heavy vaper with this device ..I clean the GGTS every ten days (especially the connections and the external surface) ..
I realised that the last week the vapor production was poor and the telescopic system had to be tight enough ...If not then the GGTS could not power on the atomizer
I tried to clean every single piece of the device..the 901 adapter, the internal pole of the upper cap, the internal cube of the button, even this tiny fuse in the base cap and the results was brilliant !!! ..My GGTS is like new again !!! Clouds of vapour and high throat kick even at 3.7 Volts !