Changing 40w to 22w result in no power at all...

Hi received theh printer this christmas, and just mounted it, put the firmware, take my time learningn lightburn, and i started making projects a few weeks ago, when Istarted, i made the material test (top one) today i made the material test again(bottom one) right now i need to cut at 380mm/m, is this normal?, i cleanned up the laser source everyweek, i mean i did a few keychans… an the laser source almost lost 10% of the power???

Also when i change to precise mode, there is no power at all coming from the laser, when i first mounted it I thought i need to configure something on lightburn, but there is nothing to configure, so i’m stuck and dont know what to do at all, also i think in reality im using the laser source at 20W, and not 40W, cause i saw videos cutting up the same DM material 3mm, at 700mm/m, and more.

Any one had this trouble, or could point me what im doing wrong?, I sended various request to the oficial webpage thats where i bought the machine, not answer at all? Maybe is cause of the chinese year???

Thanks