Well, I have tried for two weeks without success. As long as I boot from the SD card, all is fine.
It's been connected to my home network now for two days.
But when I remove the SD card and install the NVMe Hat and boot from an SSD card (I tried two different brands) I loose all network connections after 12 hours of being idle.

If I connect a keyboard and monitor, I can still use the Pi but the network is greyout out. I have to reboot.
So using the NVMe card to boot is unusable as a remote INDI server (Stellarmate). Unless I want to log in every 11 hours or so and keep the connection active. I'm just going back to the standard SD card.

PS: I am using this NVMe hat: www.amazon.com/dp/B0CRK4YB4C

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