Application crashes, disconnections, and crashes

Dear minecraft developers,

I wanted to inform you that after 1 year, my sister and I bear the hateful bugs, and only today I discovered how to tell you, there are several bugs,

1 the application crashes after 6 seconds practically not even the main menu allows me to see crasha at the initial load,

2 when my sister enters my world, after a while minecraft throws her out with the connection shield exhausted when we are with the wifi that never lessened the connection even 1 second,

3 when my sister wants to enter the my world sometimes can not minecraft reports that the world does not exist and that I have never entered a world of mine, forcing me to go out and re-enter the world two or three times before his minecraft sees my world, please can fixing these bugs as soon as possible, my sister and I can't take it anymore.