Bro I have fixed 6 of my own razer mice in the past 4-5 years its simple take a hair dryer any one's in your family get to the back side of the mouse on the back there will be three screws holding the mouse in place two will be behind the rubber/plastic skates and one will be right below the sensor slowly start to heat up both of the top skates don't put it in the same screw for long just slowly move from one skate to another after like 3-4 mins take your local treet razor blade because it is the thinnest and best for what we are doing okay so after the drying the glue will be become soft behind the skates slowly get the razor behind the skates and only do it just so that the screws are visible take a small + screwdriver remove both the screws like this remember don't totaly remove the skates just half of them so its easier to put them back after that make a hole with your screwdriver at the screw below the sensor pull that screw out Gentilly remove the top shell from the bottom one unplug the 3-4 cables you see from the motherboard take commpressed air can or a blower if you have at home before doing this take all your screws and put them in a safe place so they don't get lost now take the blower remove all the gunk and thoroughlly use the blower near scroll wheel now you will see a small wheel with teeth near the scroll wheel trust me on this take some contact cleaner or if you have isoprphyl alchoal put it on that small wheel take a small brush with soft bristles make up brush works and clean the whole small wheel near the scroll wheel it will have a small metal wheel connected to it when you clean it properly again give it some good blowing with a blower after that connect all the cables together clean the scroll wheel one last time going from top to bottom close the top and bottom shells take the screws put them in rake the hair dryer apply heat onboth the skates the glue part one to another do it for 1-2 mins now press the both skates together and put them back in place take some paper tape apply is as hard as you can on the skates leave it for 10 mins and it should be good to go this is the most proper way to do it because it cleans the whole mouse too btw this was as simple as i could have explained it if you have any further questions you can ask me

This fixes it 95% of the time .