If you havent changed anything deliberately, that only leaves a change by chance/accident. ;D
Are there grounds that have been forced under the group head seal?
Has the seal hardened up and isnt squishing as much?
Did you change baskets?
Did your arm become weaker? :

Greg

5¢ coin on the puck, dry the screen, and lock the handle. Unlock and remove. The 5¢ should leave a slight impression in the coffee--not be buried flush. On the Silvia, with the screw in the centre you may have to put the coin off-centre.
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