BLS File Corruption?

I'm using 11.5, sr3.

I am having problems with the Business Logic Services Logic Editor. Sometimes it is unable to open a file that it had created just hours before. Sometimes is cannot link to a transaction using the Transaction Call action even though the logic editor can still open the file. I have not found a solution other than recreating the file and that is getting a little tedious.

What is going on here? What is the best solution?