Hi, TL;DR - why have my last few beers overflowed when popped despite my thorough cleaning!? I've been brewing now for a few years and never used to have any problems but it seems that the longer I do this and the more knowledgeable I get (or should be getting with experience) the more mishaps...

Greetings all, Been lurking for a while, reading posts, checking out recipes etc. , when it struck me how many times in post I noticed someone reporting their gravity readings taken every 1-2 days. I was taught to not open fermenter anymore than necessary, after i put lid on I open it up once...