I'm guessing it's the APU and, no, I don't think there's anything you can do other than replace it unless the thing can be OC'd (which I wouldn't recommend unless you had an aftermarket cooler on it)
AMD Ryzen 7 3700X @ 4.2 GHz | MSI GTX 1070TI 8GB | 32 GB DDR4 @ 3000 MHz | Windows 10 Pro x64 | Dolphin 5.0-10886
