We have been in contact with Amazon support and was told that one of the reasons could be that the country settings on your amazon account is not the same as your geographic location or where the device is being used. You have to update location and payment method on your account.
We are not sure of the given answer but clicking on the OK button screencloud would restart without you having to redownload the app from the store. If you want to speak to Amazon support here's the link https://www.amazon.co.uk/gp/help/customer/contact-us
Unfortunately, we are unable to control this type of error from happening. If this will be a problem for you we recommend a chromebit or chromebox as an alternative device.