Mac sleeping and waking up every 4 or 5 seconds
My Mac goes to sleep and wakes up and sleeps and wakes up. And this is a continuous process. I am not able to type more than two letters before it sleeps.
iMac 27″, macOS 10.15
Are you connected to it via a WIred or wireless keyboard?
Is it the iMac in your signature or a MacBook like this forum?