Odd, for me they work just fine, can you provide more details? When did you save the game? Does it happen to all the saves? Can you load from the main menu/ ingame?
In what country was that device sold to you? It might be an issue with the local environment of the device (Unlikely though...)
Do you load a save from the main menu ? Or from in game? (Or both)
Where did you save those save files in game?
Did you wait a little bit? (Might be just loading)
Do you have enough ram? (Might be too many open things at once)
I'm asking all of those questions, because I can't reproduce the issue myself...