do you see anything like this in your log…?
Error executing query: (sqlite3.DatabaseError) database disk image is malformed [SQL: 'SELECT events.event_id AS events_event_id, events.event_type AS events_event_type, events.event_data AS events_event_data, events.origin AS events_origin, events.time_fired AS events_time_fired, events.created AS events_created \nFROM events LEFT OUTER JOIN states ON events.event_id = states.event_id \nWHERE events.event_type IN (?, ?, ?, ?) AND events.time_fired > ? AND events.time_fired < ? AND (states.last_updated = states.last_changed OR states.state_id IS NULL) ORDER BY events.time_fired'] [parameters: ('state_changed', 'logbook_entry', 'homeassistant_start', 'homeassistant_stop', '2018-07-13 04:00:00.000000', '2018-07-14 04:00:00.000000')] (Background on this error at: http://sqlalche.me/e/4xp6)
if so delete the “home_assistantv2” database file in /config (or cut it somewhere else) and restart, should be back to normal. 
That being said, you will loose your logbook history as you are deleting or removing the file that holds it all…