Settings Reverting

I have a small application that uses Properties.Settings to store connection
strings.  My problem is that every now and again, the settings revert to
defaults.  I haven't been able to narrow it down yet, but long ago, when
addressing this problem, I was advised to use the code below to prevent this
happening due to version numbers changing, I think, but it doesn't work all
the time, even without version numbers changing.  I call UpgradeSettings
first in the Load event.



        private void UpgradeSettings()

        {

            if (Properties.Settings.Default.CallUpgrade)

            {

                Properties.Settings.Default.Upgrade();

                Properties.Settings.Default.CallUpgrade = false;

            }

        }


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