There's a far simpler explanation than some outside actor (either state sponsored or otherwise) deciding that the best thing they can do is to muck around with freezers.
We know there's been a severe rot of operational capabilities in the military thanks for Hegseths purges and general stupidity. It's entirely possible and quite likely that over the course of his various drunken binges he decided to get rid of people who were in charge of operational control for stuff like freezers across military bases.
To be fair, if you want to mess with your adversaries troop morale, screwing up dinner is pretty effective.
General Stupidity should probably be demoted for this.
This is exactly the sort of thing that a saboteur would want its targets to think.
“If sovereign and subject are in accord, put division between them.” —Sun Tzu, The Art of War
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I would agree, but the freezers going into high heat defrost mode seems like an intentional action from someone, whether that be incompetence or malice on the side of DeCA, or malice from a third party. If they got rid of the people commanding the freezers what to do, I feel like they'd just stay on whatever mode they were already on, rather than suddenly command all the freezers to defrost