The problem would be that I can't even seem to finish a single adventure with an original group. Some of the smaller adventures I ran were Sunless Citadel, Forge of Fury, Speaker in Dreams, Eternal Boundary, & Fires of Dis. I didn't have an original group complete any of those. The players that began the adventure were not the same players that finished the adventures. Running one nighters all the time doesn't seem like much fun as the DM.![]()
That does seem a problem. While you can't expect not to lose players over 8 years, Sunless Citadel or Forge of Fury shouldn't be more than 4-6 4-hour game sessions - I ran Forge last year converted to 4e and with additional wilderness stuff it took my group 5 sessions to clear Khundrakar, ready for re-habitation by the dwarves. And I didn't lose any players over the 10 weeks I ran it fotnightly.
IME losing a player every year or so is pretty inevitable as they move away, get new jobs, etc, but if they're dropping like flies there may be other issues. It may be you're a little burnt out from DMing right now and could use a break for a few months.