Your LO should be the light and the way through the entire process. If the LO has gone MIA, you might want to pick up the phone and start calling them. My Processor doesn't even communication with my borrowers unless I specifically ask her to. If your LO has dropped out of sight, that tells me what kind of person you have selected to Captain the ship. Once your loan has been formally approved, you will get an approval in writing with conditions broken in to Prior to Doc and Prior to Funding Conditions. If you have provided those PTD and PTF Conditions, then your job is done and they are just pushing paper to get you to the Doc Stage, then to closing.
Best of Luck!