Raspberry Pi 4 4GB Image broken?

So I’ve got a Pi 3 and Pi 4 4gb running and I’m running into the problem that I’ve already had to reimage the Pi 4 three times.

After about 12/134 hours I can no longer access the Pi through the the IP Address or the foldcovid link.

I’ve already switched to a different SD card.

Could this be a cooling issue? (Don’t have a fan or heatsink installed.)

The web service is unstable. Don’t reimage the microSD. Pull the cord and connect again to recover the access again and check if everything is working again.

Cooling is one possibility, another is the power supply. Are you using the official Pi power supply?

I am using the official power supply. But this morning I had to reset it again.

Noticed that the jobs done are set to 0.
Does that get reset every time you reset the pi or have I really not completed a single job?

I’m using the official Pi power and a Pimoroni Fan-Shim