To address the iOS WhatsApp and WA Business crashing issue conclusively, please follow these 8 easy steps. Before this make sure that your iOS and WhatsApp versions are updated and you are using the most recent versions of both:
Note: Due to budget constraint I am unable to attach all the images of this flow
1- Go to Settings.
2- Click on your Apple ID on the on top of the window.
3- Select iCloud.
4- Click on iCloud Drive.
5- Select Apps syncing to iCloud Drive.
6- Disable both WhatsApp and WA Business as showing in the below image.
7- Now back to the iCloud window and select Show All as shown below image:
8- slide down and stop the synchronization of WhatsApp and WA Business as shown in the image:
9- Now back to the desktop and use you WhatsApp or WA Business.
This resolution targets potential problems arising from insufficient iCloud storage or network issues hampering data synchronization.