Sounds a bit like a boot error try wiping the cache partition This will clear the boot memory so you get a clean boot . Try it and let me know . If all else fails do a factory reset but remember to back up your data. This video shows how to hard reset or factory reset https://www.youtube.com/watch?v=IdwT5fQS...

instead of doing the reset go down to wipe cache partition and do that first and see if that brings joy . If you get no joy then a factory reset will probably fix it but again remember to back up your data and contacts as a factory reset will wipe it clean . And @mayer I wasn't online yesterday so the bump did help and Brayden hope this helps