Hello programmers, so the other day, I was on Twitter dragging giveaway as usual . (You can't blame me, economy is hard and the lockdown is mad) when don jazzy said for you to qualify, you need to register an account on VF Bank app.

You already know what's up, everyone rushed and in a couple of seconds, the app crashed, login no longer works, it kept saying error and the rest.

Been thinking about what actually causes mobile apps to crash in terms of huge traffic since there is no buying of hosting, hence no selection of bandwidth et Al.

To the professionals in the house, why do mobile apps crash?

Please align your answers to : traffic, network error, app closes itself, login errors, continues loading and no response, you can add others too.. thanks as you respond to this

Programmers in the house, please my curiosity is waiting