Even though the filters have been changed, still sounds like the main filter may not be seated all of the way into the front pump causing a loss of prime. The seal in the pump where the filter connects can also come loose causing the same problem. This is very common. The filters are also know to crack down the side of the filter causing a similar issue. There is a TSB on this beleived to be caused by the spin-on cooler filter from MOPAR with the letters "AB" at the end of the part number on the outside of the filter. Might wanna drop the pan and have a look before doing anything drastic.