[Dx4win] loss of qsl dates

[Steve K7AWB]

I recently discovered that all my QSL dates were missing from my log.  The 
computer that the log is on sometimes reboots by itself so I don't know if 
there is any correlation.

I discovered the missing data when some QSL cards arrived and I attempted to 
enter the data into the program.  I noticed that there was no QSL dates that 
represented the dates I sent the QSL cards to the other hams.  I  entered 
the date of April 20, 2013 as an approximate sending date as I did a large 
batch of cards around that time.  At first, I figured that I missed a few 
dates in the log, but checking on the LOG display, I noticed that there were 
no dates going back to my first entries in 1957 except my April 20th dates.

Any ideas ?

I do have a back-up done 6 months ago, but I don't know how I would only 
enter the QSL dates and not affect any other data.

Is this an unusual event to lose all the data in one field throughout the 
program?

73

Steve Sala
K7AWB
DN17es
Nine Mile Falls, WA