I replaced fans and also repasted the laptop with Arctic MX-6. The repaste definitely helped. From my temperature logs, before the repaste the CPU was going up to roughly 100–101°C and the NVIDIA GPU was around 86–87°C before the crash. After the repaste the CPU temperatures are lower than 97, and in one of the new crashes the NVIDIA GPU was only around 63–73°C. Unfortunately, the issue is still there. The GPU still disappears with Xid 79 / “GPU has fallen off the bus”. So the difficult part is that I also cannot clearly say “the GPU is dead”, because the laptop can work normally under load and even at higher temperatures for some time. The crash does not seem to happen exactly at one specific temperature or load. At this point I am trying to understand how to debug the real trigger behind the Xid 79 event. Any ideas what else I should log or test would be very welcome.