Answer / hiren

First is not column proper installations  
Secound is not proper work syrring
Thred is injector septa so much punching 

Answer / ahmed

Also because of glass liner damages

Answer / yogesh patel

flow rate of gas not proper its cose fluctuation in assay

Answer / alasyam ramesh

1) Improper stabilisation of column and system.
2) injector septa bleeding
3) partial blockage of detector jet.
4) syring struck due to solvents nature( solvent viscosity).
5) plunger moving and taking improper injection volume.
6) some time may effect room temperature also

Answer / b.gangatharan

If %RSD is failing in GC calibration means we have to check & replace following things,
1.Injector septa
2.glass wools in liner
3.syringe
Thanks,
B.Gangatharan.

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