I-Class SM Carryover Issues?

-Blank after high sample shows significant CO (almost as close to LOQ), however, an air blank immediately after high sample has less CO (preferred outcome) and a consecutive sample blank after the air blank shows higher signal than the air blank. 
-Needle, sample loop, needle seal, injection pod and syringe all replaced. 
-Tried increasing wash too.
-SNW=MeOH; SNW=0.1%FA+10%MeOH in Water
Anyone have any ideas as to where the CO might be coming from? The same method with the same wash had not been producing this.
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