While not painting everyone with the same brush but the only way a Lee 1000 will detonate a primer is the primer is not in the slot and we try hard, thinking "It will go, just some pressure" Got the T-shirt.
At one time I had three Lee 1000s. One was set up for45acp. Loaded thousands shooting IPSC in the 70s. Mine had theplastic ger underneath and I tosed it in aa drwer. If things got a little out sink I ssimply turned the turret to the next click. Allthat gear does is to be driven by screwdriver to progress the shellplate when it get out of time. Big whoop.
If you keep the primer tray 1/3 full (no less), keep the primer try clen, nd definitely blowout the chute every so often. I use a small compressor for an iarbrush. I also polish the tray with Pledge or Behold with a que-tip and I clean and polish the chute with the polish also. Slicker than the baby waste.
The primers are driven by gravity and any impedience or lack of push will not put the primer on the seating pin. If the handle hits a wall - stop.
You may have to tap the tray once in a while to get things moving. That little arm does not do the job everytime.
Have fun and good luck.
Develop a nice rythmn but if it talks to you stop and look.