various bug

Hello excuse me to disturb you I allow myself to contact you because I have various beug on minecraft Pocket edition version 1.4.4.0 the first beug it is when my phone is my standby and I go back on my game I be texture problem on my block or be my hand and my hand held objects become invisible and also just after when I leave the game to return to the main menu following the beug my main menu screen jumps and the second beug is since today when i open the application it this re closed automatically so i uninstalled them and reinstalled now the application still hang on the minecraft screen i hope to have a return from you and that the problem be solved by the following cordially. (Phone Samsung Galaxy J5 2017)