My iphone4s can not update any apps. Nor is it able to download any new apps. What should I do?

my iphone4s can not update any apps. Nor is it able to download any new apps. What should I do?
I have two Apple Accounts. One in Switzerland and one in China. I used to be able to updates all of my apps by clicking individual apps. One day I clicked update all by accident. Ever since that, my iphone cannot update any of the apps. Nor is it able to download any new apps. Please kindly let me know how to make the phone back into work with the apps.
Many thanks.

I find it difficult to believe that it took you a year to realize your phone was defective.
Restore the phone as new. Wait a couple of days before adding any apps to see if it's running ok. Then, add apps a couple at a time so that, if any of them cause issues, you'll have an idea which one.

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