FID won't stay lit


Over the past month, our 8860 GC will not remain lit.  We can get it to light initially, but eventually the FID signal will fall below the FID offset (which I have changed from 2pA to 0.5pA).  This will usually happen after a few injections.  Our flows are:

Air: 400mL/min

Hydrogen: 35mL/min

Nitrogen: 20mL/min

These are the same flows we use for our 7890 GCs and have never experienced this issue, so I am a bit stumped on why we suddenly have this issue with our 8860 GC.  Any help or guidance would be appreciated.  I have cleaned our detected, inlet, changed our jet, liner, septa, column, and gold seal.

Thank you


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