It could be temps. Please download HWMonitor (free) and run that. In the HWMonitor window, expand the CPU temps section, so we can see the temps for all cores, and then post a screenshot of that display.
Laptops do benefit greatly for a regular clean, especially the finned heat exchanger right next to the fan. This is where ALL the cooling is done, yet the heat exchanger is a magnet for dust and fluff. If it's never been cleaned internally since you've had it I would recommend a good internal clean in any case.
I also note that you're running mismatched RAM. You have a stick of RZX 16GB RAM (RZX-D4D22M3200BL-16G) and another stick of Samsung 8GB RAM (M471A1K43EB1-CWE). It's always unwise to mix different RAM types because the critical RAM timings may be different. RAM should always be sourced in packs of matched RAM to ensure they all use the same timings. I suggest you leave in whichever RAM came with the laptop and remove the other stick. See whether the crashes stop then.
