Drifting of all internal standards on ICP-MS

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METALHEAD
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Drifting of all internal standards on ICP-MS

I run a Thermo ICP-MS, I recently changed the cones.
Since then, I have very high count in my int. std., which is Bi,Te,Li,Y,Sc,Tb. I have tried to dirty the cones by running
Ca through at 400 ppb. It stabilized for a while today then
drifted up. Any Suggestions?