Why does my pyrogram bot keep turning off?

Question

For some reason my bot always turns off without printing any output to the command line or showing any kind of error. The bot functions properly for a few hours after being turned on. Basic code looks like this:

app = Client("my_account", '123456', '123456789abcd')
TESTING = "321"
USER_ID = "123"

chat_mapping = {TESTING: "-10011111111111", USER_ID: "-10011111111111"}


@app.on_message()
def my_handler(client, message):
    if str(message.chat.id) not in chat_mapping:
        return
    elif str(message.chat.id) == USER_ID:
        storeMsg(message)
    else:
        print(message.text)

app.run()

Any advice would be greatly appreciated!