Tune Report Agilent 7900 ICP MS

Hello dear community,I have a small problem with the mass number lithium 7. I have already changed the hoses, rinsed and replaced Tune solution (shelf life until May).  What else could be the reason? Also, the Gd curve is not so nice. I'm out of ideas. I'm out of ideas. Can anyone help me with this?? Thank you in advance. Regards 

p.s. my english is not so good. I apologize for that

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