what's up couldn't start please restart your iPhone if the problem continues?

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.

WhatsApp is not an Apple product. Contact the app developer here --> App Support or WhatsApp FAQ or Contact WhatsApp

WhatsApp Business is not an Apple product. Contact the app developer here --> Developer Website  or App Support  or WhatsApp business products - WhatsApp FAQ

I have this problem too. I have noticed that when this problem occurs other applications are not functioning:

1. Some maps applications, including native maps application isn't working. Google maps main map isn't loading, waze isn't loading, Apple maps is loading but can't get fix location. Some other map based applications, ex zillow, is working
2. Othe application, ex my private banking app, can't load any data.

I believe the problem is a system one and not related to whatsapp

I have the same exact problem , and then my google maps dont work and so much more weired stuff happens

I tried everything it works fine for awhile but then same issue

I am able to reproduce the scenario but I don't know what the root cause is.

In order to access my work account I am using outlook.com via safari (tried also via edge).

When I am checking my emails via outlook.com I can see the other apps stuck. Sometime it is immediately some time it is after few hours but if I don't log in to my work account for several days via (outlook.com safari) everything works just fine.

I get the same message, randomly

Any solution so far??