Yesterday I started seeing reports of people having issues with their AppStore constantly reloading/refreshing so they were unable to search or download any apps. Apple’s status page reported no issues however, more and more reports were happening on various devices iPad’s, iPhones.
Approximately after one hour I too experienced the same issue on my iPhone 8 plus. Upon investigating the only thing all of these devices seem to have in common were that they all had iOS 11 installed.
Fixing the issue requires a simple reboot of the device, however it is strange that this issue seems to be affecting users at random times and there doesn’t seem to be any official confirmation from Apple that there is an issue.