All the Latest Game Footage and Images from Dark Place In the darkness, they are approaching. The protagonist is a detective who has come to the location to search for a person who has disappeared at ...
Sometimes I can spell complicated words without needing the spellchecker! A lot of the time, I'd say that the version you choose will depend on the word you want to emphasize.
'Sometimes' refers to a number of instances, in which case you would need to refer to more than one call, but you wouldn't use 'sometimes back'. You have a typo and a missing article.