Oh, I didn’t know that two models exist.
On my bill, it says “Anker SOLIX C1000 A1761311”, but according to Google, the A1761311 model seems to be the C1000X
Solix C1000 DC plug shuts off automatically
First, try updating the firmware to the latest version v1.3.2+, which improves car port performance for low-power devices like fridges. You can also check the Solix app or display to see if you can extend the car port shut-off time to better match your fridge’s needs.