Whatsapp Crashing every Minute

Hello,

I have a problem with my account - it doesn’t matter whether I am using Whatsapp Business and Whatsapp on iPhone

My account seems to be corrupted and causing Whatsapp to crash every 45-60 seconds. I can’t back up my chats, send long messages, listen to audios or watch video content - any process that lasts longer than 45-60 seconds. 

I’ve reached out to Whatsapp several times and have done all the things advised: 

- delete whatsapp and reinstall it from a backup
- switch from Whatsapp Business to Whatsapp
- switch from Whatsapp to Whatsapp Business
- restore the iphone to factory settings 
- buy a new iPhone and install on a new phone 

Backing up over iCloud doesn’t work (I tried this and lost 6 weeks of data). Unless I am meant to backup over iCloud and then reset the phone from factory? Nightmare re-setting up the dozens of other apps I use. I haven’t tried creating a new Apple ID and trying to install my backup there on a new phone (because that would involve a great deal of inconvenience with no guarantee of success).

I now can’t backup my WAB or WA up at all as the app won’t stay open long enough to achieve a backup.

I have had the account since 2016 and it has all of my business chats there. I can’t / don’t want to lose this information or history. 

The size of my account is 26.83GB (not that big) and I don’t have issues with any other apps. 

I’m really desperate for some help, if you can. THANKS!