Help with developing

I use HP4 plus 125 and last few times I have proccessed the film it starts getting small blisters while drying which turn to spots when the film is dry.....my guess is that I am fixing it longer than necessary, I use Lauder chemicals "Rapid fixer" and am wondering if I am right. If this is the case, will reducing the time of fixing stop it or is there another culprit to these blister? Any help will be greatly appreciated.

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