ICP MS 7900 Error 1218.

Hello, we have the following problem. Our ICP MS 7900 ignites plasma, then burns for about 10 seconds and then goes out. The device shows error 1218 (Plasma was shutoff (Plasma RF monitor)).

Would any of you have such a problem? What have you done? Could you solve the problem yourself? If yes how? I thank you in advance for your help.

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