Do you have it set to revert back to the Today Screen?
Settings/Today/Items Today Timeout checked?
Try unchecking that - if its better then something on your today screen is causing problems or just that setting is broken... (actually, either way its possibly something on the today screen - if tjust unchecking the above doesn't fix it then as another test try removing all the today items except the stock ones... keep adding back 1 new one every night until she hangs again
