This game is great but...

This game was great until recently,I was making a Hogwarts school of witch craft and wizardry the minute I got all the supplies I needed the game froze. My screen went black then it returned me to the home screen so I deleted all my mods and texture packs which made it worst now I am only able to stay on for 30 seconds please fix this glitch thank you in advance

Bajeebus101 about Minecraft: Pocket Edition, v1.1.3