My TR4 II 360 OC AIO's pump failed recently; it took about 1 hour of intense Deep Learning training to reach 100 degrees at which point the motherboard shut dow

My TR4 II 360 OC AIO's pump failed recently; it took about 1 hour of intense Deep Learning training to reach 100 degrees at which point the motherboard shut down. I was dumbfounded about what was happening, then after ruling out Titan RTX, power supply etc. problems I noticed a slow climb of CPU temperature. AIO manufacturer didn't even ask for anything and sent a replacement right away and computer is happily number crunching again.