Why is my trackpad is not functioning properly?

i have a problem with my trackpad, it is not working properly, its moving erratically, i dont know what wrong with it, ive tried to reset my SMC and it works fine at first but after about 20 minutes, it goes back to moving erratically, please help me!!

Try a permissions repair:
Go>utilities>disk utilities, hightlight your user disk in the left corner (Usaully named MacHD, or what ever you may have named it)
click repair permissions.
If the problem still persists you need to take it to the Apple repair center,

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