I have found another way if you want a temporary solution to sort the loading problem you need to press and hold the Cortana (search button) wait for the listening prompt and press the back button and repeat all this two or three times, this works every time so far, but when you reboot you will need to repeat this all over again.
1. press and hold the Cortana (search) button when the screen is blank or says loading...
2. wait for the listening prompt
3. press the back button until you get back to your loading/blank screen
4. repeat this two or three times in succession
Works every time for me. Good Luck