How do I overcome low sensitivity during start-up?

Running a 7800 ICP-MS and during the past two weeks have been experiencing difficulties. The doubly charge percentage has continually risen with each day of testing. I have removed and cleaned the cones and lens stack and conditioned before use. I checked the nebulizer and spray chamber for blockages and build up and didn't find anything. I have removed and cleaned the torch/bonnet in a 5% HNO3 solution overnight then dried and replaced the components. 

After all these steps I started up went through the warm-up process and then received the following error during plasma correction.

HW Settings: Plasma Correction 

Hot plasma correction failed because sensitivity is too low(140 u below 3000 CPS). Ensure the tune solution is being introduced into the instrument. Check the sample introduction system (Nebulizer, Spray chamber) and carry out maintenance if needed. 

I spoke with Agilent and overrode the plasma correction error, but then the machine errored again during Auto tune as the auto tune failed due to low sensitivity as well. 

Any suggestions on what to do next is there something obvious that I am missing? 

Anything helps thank you! 

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