Vc4 keeps crashing

My core 4 keeps crashing many hours in to a print. It gets a significant way through a 2 day print and keeps just becoming non functional. Klippy log doesn’t show any klipper errors. I have to restart the printer to gain connection as I can’t ssh or browse the mainsail interface when this happens. Does anyone have any suggestions on what to check as I’ve currently wasted 5 kg of filament trying to solve this
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