Fan Shim will not allow RPI4 to boot

@Tigertron wrote:

So I had setup my Raspberry PI 4 and everything was fine. I received the fan shim and installed it and it seemed to be working. I booted several times. I have not had the opportunity to play with it so it has been sitting on my desk. Today I decided I would experiment with it. I booted up the RPi without issues and did an apt full-upgrade now I can not get the RPI to boot if the fan shim is attached. It works just fine when it is removed. I am using the official 3A power supply and only attach the hdmi to see what is happening.

I goes into a continuous loop of not being able to read a ext4 partition.If I connect the fan shim after it is booted it seems to work ok.

Any ideas why it wont allow the RPi to boot?

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