Question Ryzen 5 3600 temperature problem

[Chona220]

Hi, I have a Ryzen 5 3600 paired with an Asus B450-A and a Thermaltake 240 AIO and my temps have gone from 40-50 °C at idle and 70-80 °C while playing, to 70-80 °C idle and when I try to play games (the CPU usage is about 40%) it shoots up to 110 °C and turns off.
I already updated the bios, formatted every disk, updated every driver, and tried almost every configuration in the BIOS, the CPU is at base clock and undervolted and is set to throttle at 90 °C but it doesn't.
There is plenty of airflow because I have the PC case open.

 

[KyaraM]

If it happened so suddenly, the pump might be broken. Touch the pump while the PC is running, does it vibrate? Are all fans running?

 

[Chona220]

If it happened so suddenly, the pump might be broken. Touch the pump while the PC is running, does it vibrate? Are all fans running?

the pump is working I can feel it vibrating and also the water flowing through the tubes and it's not that hot.

 

[scout_03]

try a repaste and press any of the pump pipes to see if there is any change in speed or temp you could use hwinfo to check this .

 

[Chona220]

try a repaste and press any of the pump pipes to see if there is any change in speed or temp you could use hwinfo to check this .

I already did a full rebuild of the pc and nothing improved, when I took apart the pc the thermal paste was ok, it wasn't dry or anything
I think it may be that one of the sensors is malfunctioning and is making my PC overheat

 

[scout_03]

what readings you have with hwinfo and see if you could rma the board for defective sensor .