I'm from a cafe in Cheyenne, Wyoming, and we've been having a problem with shots with extremely bubbly crema that collapses to less than 1/8 inch in a few seconds. It seems to happen more frequently with the naked portafilter (which we use only for triple shots; our double baskets are divided), and it occurs sporadically - I can pull a great shot, and then with no change to grind, pull an extremely frothy one.
It doesn't seem to be the freshness of our beans - we've had the same problem with coffee that's everywhere from 7 days to a month old - and I haven't really been able to find any other reason why this might be. What's especially frustrating is that we've never had this problem before; we've been open for four years, and this has only started happening this summer. We've had our machine (a Faema E92 Elite) completely refurbished and even changed roasters, but nothing seems to help the problem. Any advice would be appreciated!
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