I know spinning disks are fragile, but I've had more problem with cold storage of SSDs. They just seem to forget information or flip bits when they're not kept

I know spinning disks are fragile, but I've had more problem with cold storage of SSDs. They just seem to forget information or flip bits when they're not kept powered up. Don't ask me why. Since I need cold storage, I hope that hard disks continue to be around.