There is no good reason that I can figure out for this to be happening. I have been starting the ADMIN task in the evening and stopping it in the morning.
I would assume that this requires a program temporary fix, or PTF. You can search for PTF's though IBM. If you don't find the answer there, you can also report APAR's from the same area. I found 39 PTFs for Domino, but none addressed either of those jobs. The fix you may need just might not be listed in the key words.