I always bottle my brews and have had no problems until my last couple of batches. On these two batches which have been conditioning for a couple of months now when I pop the cap everything is normal but once I start to pour it into the glass an extraordinary amount of foam is produced. I then have to wait what seems like an age for the foam to settle before I am able to enjoy the fruits of my labor. I have no idea why these beers should be acting in this way I used my normal amount of priming sugar (1 cup DME ), the gravity readings were consistent for several readings ( both beers were in the primary for 2 weeks and secondary for 4 and 5 weeks) and my sanitation was exactly the same as it has been for all my previous beers. Does anyone have any ideas as to were I have gone wrong so I can avoid this problem on future brews?
Thanks in advance for any advice.