The same happened here and I ended up using what two users wrote that worked for them:
I had [set] swappiness to 0. Changed it to 10 and hibernation is working fine now regardless of mem usage.
The same happened here and I ended up using what two users wrote that worked for them:
I had [set] swappiness to 0. Changed it to 10 and hibernation is working fine now regardless of mem usage.