I am a P2Pool newbie and I have a problem using this pool. I have a machine running at 1000khash/s, but the payout is very unstable. I am getting the "accepted" messages almost every minute. However, sometimes I get zero payout for a few dozen minutes, and my address is even not listed on the pool website during this period

I have this issue on both Windows (use the precompiled w64 binary) and Archlinux machines. Is it normal? Perhaps I don't understand the P2Pool payout logic correctly???
Any help will be greatly appreciated!
