Custom skins desapear.

Sometimes custom skins resets and changes to a default one just with existing.

Steps to reproduce:
1 Create a custom character as you want (if you can because most of the time they don't even work)

2 Just wait.

What happens:
It changes to default: steve or alex

What should happen: skin shouldn't reset.

As I said it just happens, I don't have any idea why or when but sometimes I just open Minecraft and my skin isn't there