Game repeatedly crashing

I play bedrock/pocket edition on my iPad. Within the last month or so I have been having issues with the game crashing. I will be able to play for a bit, usually about 30 minutes, then it force closes the game completely. After this, I am unable to open the game for more than 5-10 seconds before it happens again, over and over. I usually have to stop playing until the next day before I can open the game without the crash. Every time it force closes I lose things, (experience, animals, loot, parts of farms, hopper minecarts, etc.) on top of the fact that it resets to where I was when it crashed. I am extremely frustrated and would appreciate your assistance. Thank you.