I use Coinbase for my Crypto trading. Lately I ran into an issue with Coinbase app on my iPhone 12. Home tab was showing correct information about my balance and prices of the coins I hold. When I will go to Porfolio tab, I was getting error message. I tried few things like, close and restart the app, restart the phone etc. Nothing worked for me. Eventually I decided to delete the application and reinstall. And it worked! It seemed that some update corrupted some data that prevented data for portfolio tab to not load and throw some error. Give a try to this tip if you are running into similar issue.