If BIG GOOGLE MAP is not working on your home page. Then please check your all post, there is missing Google Value "Latitude, Longitude". 

If you have post any latest post and after that post MAP is not working then please delete that post and visit your MAP will work fine.

Otherwise Delete ALL Post and then go to Trash and "Restore" Posts one by one and check which post have missing 

Google Latitude And Longitude.

Thanks