Most have already responded, maintenance is needed, you must change thermal paste and clean well with isopropyl alcohol with compressed air, also when you are going to assemble, that everything is well placed, especially the fan, that there is no air leak, with A single opening does not leave the air as it should be, in such a way that the processor heats up quickly, especially the one with your equipment, the high temperature makes the processor work at 100%. but in case the above does not work, use a program that shows your lap temperature, look for Speedfan, it shows you all the temperatures of each important section. Also just in case, also consider the antivirus, especially AVG, Avast, Kaspesky and BitDefender. Accompany it with depth antivirus such as Superantispyware and Malwarebytes Antimalware, they are the best I know