My CPU has been overheating lately too. My first instinct was to suspect my AIO was starting to fail since nothing else has changed. Immediately after booting up, core temp of 41c, fan speed at 1215rpm and pump speed at 1307 rpm on quiet. After running a CPU stress test for 5 minutes, core temp was throttled at 100c, fan and pump speed both abut 2650 rpm on performance. Even after letting the rest and cool down for 5 minutes afterwards, temps had only dropped about ten degrees keeping on performance.