idle 77+

Recently my PC's temps have been spiking up again with idle temps at 77C, even tho coolant is around 33C. Cpu is 7 5800x Aio H100i Platinum SE Thermal paste is MX 4 and the case is 465x icue with 5 fans in total including radiator ones The thermal paste is brand new and applied it 2 days ago. I...