I figure with the combined knowledge of everyone here, someone will be able to aid. Our kegs have WAY too much pressure in them whenever we depressurize them, the tap will suddenly freeze up, though the keg is half full. I mean literally freeze up, as in we have to rub the lines with a hot rag for it to work. I checked the filter, and it was just full of foam - which is what the tap releases very slowly whenever this happens or when we change the keg. Our nitro will suddenly stop working, and the tap will just release cold brew. We’ve called it in so many times, to no avail. Does anyone have an idea as to what’s going on?