Hi fader77, I know the feeling. I was there once and it was doing my health no good. Devise a plan for fading, say it's depression or burn out if you like. I stepped down the elders asked if I just wanted to take time out instead of resigning so be prepared for that. Also the CO wanted to see me, I used to give talks at assemblies and schools and had been given some to do.
All the best, be true to yourself. You ask if anyone has resigned from the platform? Yes a few have, there is even a recording of one if you search on here for Little Toe.