keyboard unsupported device warning since updating to ios 11

Ever since my iPad Pro 9.7 in has been updated to iOS 11 the apple keyboard has become almost unusable. Constant pop up saying this device is unsupported. I have made sure the contacts are clean, I have restarted the device, it will eventually work after a while. When it does finally work it will be slow to respond will give false input from time to time. This never happened in iOS 10.