From what I understand, your device is having trouble with memory. Have you tried cleaning out the the device and removing any unused files? If the space on the device is full, it’ll have trouble saving the whole game. You also want to verify how much memory is being used on your game. Checking out the [Stat Commands documentation][1] might help you gather additional data.
Since your project is running smoothly on another device, try the stats commands on that one first, to see how much memory is being consumed and compare it to your type of device that you’re on.
Provide me with the model of phone that works too.
Thanks!
Stat Commands in Unreal Engine | Unreal Engine 5.1 Documentation