Ok we have been at this pumping thing for about 2 months now and its truly the greatest thing ever Only thing is that after we had massive heat up here we had like 5 loss of primes in the span of 2 days. Called Animas and they sent out a new pump and they said they wanted the cartridge that was in the pump when we were having the issues. New pump comes and we switch it all out and get her hooked up and what do you know we had to more loss of prime. I am thinking the cartridges are suspect since we switched out the box of cartridges we haven't had an issue. Has anyone else had this happen before? If so did it clear up after you stopped using the box of cartridges that you were using when you started having the issue?