Kindle Fire Edition: Multiple Crashes

my game has been crashing multiple times on various things like:

• When the game is starting up
• When joining a realm
• when joining a world
• on the main menu
• when joining a world with a high number of addons on it
• when joining a world with a high memory size
• And just sometimes outta nowhere

the model kindle fire i have is a fire hd 7. but on my cousins fire hd 8, these features arent present; even though both tablets have similar specs.