does d76 get more grainy with age?

hello-

i've been using the same batch of (1 gal) d76 (used as one shot @ 1:1) for about 4 months now and recently my negs (plus-x and tri-x) seem to be getting more grainy, i'm wondering if it's due to aging of the developer? i keep it in a plastic jug and squeeze out as much air as possible but it's gotten so low as to not be able to keep all the air out....... the only other thing that has changed is my development temp has gone up, i used to do everything at 20 oC but with the summer i can only get down to about 22-23 oC, i have shortened my development times accordingly (i think)

thanks for your replies! joe

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