Base Line Plateaus - electrical interferences?


we are using the GC/MS System 8890 and 5977B since october 2022. Since 3 days I see baseline plateaus, irregular in some injections at changing positions as shown in the following image.

The plateaus appear in 1 injection, the following from the same vial has no plateaus and the next shows them again at different positions and so on.


I read, that it could be caused by electrical interferences. 

Did anyone see those baseline plateaus before and could tell me, if it really is an electrical issue and if yes - what would be a good approach to fix it? Is there a device I could connect between the GC/MS and the power supply network?

Every help is appreciated.

Thank you very much.

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