So I've been using the Bubble Magus BM-T11 for a few months now, and for the past few weeks one of the heads has been falling off every day or two! I know that it's secured properly with all of the clips on the back fully inserted. Photo 1, Photo 2, and Photo 3. It's the one I use for Calcium, and I'm only dosing a few milliliters per hours, but when this happens it also pumps a large amount of calcium into the sump. No issues with the one for Alk (pump 1) or the one for NOPOX (pump 3). Is this an issue with the head, and I just need to replace that? Or is it the motor? First time I've used a doing pump btw. What is going on here?!