cpu fan error

hello i have this strange problem i hope someone can help me with when i start my computer up for the first time it says cpu fan error please press f1 and i do and it takes me to bios when i look at my cpu fan it is working it is going between 2100 to 2500 rpm so i think to my self ok nothing is wrong and i exit bios and start my computer restarts fine boots and all i can play and do what ever i want with it for hours no problem but it is always when i shut down my computer and start it up a few hours later it says again cpu fan error i never encountered this before is there a setting i have in bios that i turned on by mistake to do this i have no clue i am a little tech savory but no were near some other people if anyone can help me i would be most appreciated thanks oh my specs are

asus tuf 570 motherboard
ryzen 5800x
geforce rtx 2700
16 ghz ram
windows 10 pro