Are you on the released version of Win10 or the beta builds?
Most important - Have you installed al the updates? This is system updates and app updates... You can check by opening settings and going to Update & Security...then checking for updates. For App updates, open the store and click on the picture next to the search field, then click on the download and updates.
Also - Have you checked to ensure your computer hasn't used all your resources while doing background tasks? I have seen this on a computer. I just waited the 10 minutes for it to finish what was doing and it started to behave.
Also - Have you verified your account is set up correctly? Perhaps you can remove it and re-add it.