Last weekend we made a 5 gal batch of hefeweizen and it all seemed to go pretty well. After sitting in my 5 gal carboy, for 16 hours, I heard a small "pop" come from the room it is sitting in. When I went in to check and I saw the top of the fermenter lock blown completely off and foam oozing out of the carboy and into the container it is all sitting in. It looks as though close to one gallon of beer has been leaked out but doesn't seem to have affected the beer in that is still in the carboy. My 7 gallon bucket is occupied thats why I put it in the carboy. Should I get another bucket for the next batch or was that something kinda rare?