I have the same problem. My GL702ZC broke and had to RMA it (the fans ran up to 6000RPM plus right after BIOS and stayed that way, no matter what). When I got the machine back, one of the speakers was crackling (the housing of the speaker was almost touching the chassis, and the screws of one speaker was totally smeared by the screwdriver), the BIOS battery was not glued properly to the motherboard and was moving inside… long story short, the company doing RMA in Hungary sucks (they always have) and did an awful job in assembling the notebook after replacing the motherboard.
With this fixed laptop now, I gave the new 18.6.2 driver a spin, cause it featured new Vermintide 2 profiles targeting RX 580. All following info obtained by the Overlay feature. Framerates are nice (55+-5 FPS on almost highest settings), which is still in the FreeSync range of the monitor. However, temperatures are high. 81°C constantly, and in effect rich scenes it does throttle after reaching 85°C (drops core clocks from 1077 MHz to 1015 MHz), when reaching 87°C it drops to 977 MHz. A notebook of this size should not throttle under non-synthetic workloads. If it does under FurMark, that's also worrisome, but can still go under the radar. However, production game titles should not turn a notebook into a stove. Vermintide 2 and Rise of the Tomb Raider (MS Store version) both throttle.
