That is normal. The crystal set works optimal in specific range of temperature. Too cold or too hot and the power is under par.
All DPSS laser behave like this.
JUST DONT LOOK AT THE LASER BEAM!!!!It outputs IR like normaly, but the crystal like messes up and wil do about 1/8 of the work it should.
what power is your laser BTW?
Dude!! Where are you? It's -35°C here today!!! (-31°F)