Execute SQL Task does not Update from a Date Variable Reliably

I'm using a DateTime variable in SSIS 2008 that is used to set the SQLStatement property of an Execute SQL Task.
"DELETE FROM Labor WHERE Week = '" + (DT_WSTR, 100) @[User::Week] + "'"
Week is the next Sunday:
DATEADD( "day", @[User::DaysTillSunday] , @[User::TheDayThatIsTwentyMinutesPrior] )
DaysTillSunday:
DATEPART( "dw", @[User::TheDayThatIsTwentyMinutesPrior] ) == 1 ? 0 : 8 - DATEPART( "dw", @[User::TheDayThatIsTwentyMinutesPrior] )
TheDayThatIsTwentyMinutesPrior:
(DT_DATE)(DT_DBDATE)DATEADD("minute",-20,GETDATE())
The SSIS Package deletes the current week's data, reloads it with fresh data, then calculates the difference between the current week and last week.
The problem is that randomly, instead of deleting the current week, it will delete the previous week. This happens maybe 5-10% of the time. At least it does until I rebuild the package and import it into SQL Server again.
I'm guessing that the Execute SQL Task is not updating the value of the Week variable before it executes. I started with the source type being a variable. Then I decided to try Direct input and pass in the Week as a parameter (OLE DB Connection
Type). That didn't work either.
Most recently I tried writing the Week variable to a table first, then having a sequence container with all the tasks second. Slightly better but I still saw the date was wrong 2 times in about 90 executions. I was hoping that writing the Week
variable out to the database would force an update of any associated connections to it, but that didn't seem to work.
Any ideas? Is this a known issue, am I missing a setting?
thanks,
John

John, computers either work all the time or have a bug. I suspect it is the latter.
To find it [faster] you need to log what the resulting expression was used in the package.
I am baffled how rebuilding a package would fix anything like setting a date.
It might be even dependant on when you run the package.
Why
DATEADD("minute",-20,GETDATE())
DATEADD( "day", -8 , GETDATE() )
It must be enough to set the week (that appears to be a date) as above.
Arthur
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