Why does write datalog sometimes take up to 20 seconds to complete?

I have been using this vi for a number of years with no problem. I recently upgraded to LV 2013 and added some functions to the code but haven't changed the write datalog function.

Basically when I make a change to a front panel object I want to save the settings so I write it to a datalog file as in the ChangeCrop.png file. I have been doing this since LV 2010 with no issues. After upgrading to LV 2013 and adding some functions unrelated to the write datalog, occasionally now during the write process things come to a grinding halt for up to 20 seconds.

Using probes I narrowed it down to the Open/Create/Replace Datalog.vi in the datalogDiagram.png file. Watching the time stamp on the probes I found the 20 seconds between the path creation and the completion of the Open....Datalog.vi

Any ideas?

Alan