System cannot find the path specified for existing csv file

I get this message at random and have no clue why.
Context: let's say I have local variable in Keyword Test called "defaultDbAccess" and it's of DBTable type. As its default value I set path to viable csv file with all the data needed. It works fine for most of the time, but Test Complete "randomly" returns error from title: "System cannot find the path specified". After the error next run will go smoothly, with no problems in locating file. 

Can it be the problem with initializing variable with default value, instead of explicit call in Keyword Test?

I also use git integration and thought it may be problem with some random locks - but why would they occur, and why would they disappear..? 
I wish I could give you more information.