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Get your @qgis update to 2.8.4 qgis.org/downloads/QGIS-OSGeo4W-2.8.4-1-Setup-x86_64.exe or 2.12.1 qgis.org/downloads/QGIS-OSGeo4W-2.12.1-1-Setup-x86_64.exe or directly from #OSGeo4W
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for a list of fixes in 2.8 check the latest pages of github.com/qgis/QGIS/commits/release-2_8 or 2.12 github.com/qgis/QGIS/commits/release-2_12