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There are several possibilities:
What do you have near the TV or monitor? Loudspeakers or other devices which generate magnetic fields can easily cause all sorts of color purity problems. Relocate the offending device(s) or the TV or monitor and then degauss it.
See the section: Degaussing (demagnetizing) a CRT.
If the problem still persists, purity adjustment may be needed. However, this isn't likely to have changed so look for other causes before tackling these adjustments.
I don't really know how much of a problem (2) is in practice or whether some manufacturers compensate for it.