I have 2 questions:
1. Why did it go down?
2. Will it go up? Why?
It doesn't go up like echris1 said. It had going down from 0.5 to 0.03 and now it's 0.04. Way below the average.
Update to the latest version (git pull), restarted it...
Still the same!
I have set an option "--fee 5.0", will it affect my current payout?
Well, your payout has gone up again, but it will take a day or so of constant running to push that payout rate back up.
The fee shouldn't affect you, since the --fee tag is only applied to people mining on your node with their payout address as a username, for example if your running a public node. And even if you did do it that way, those fees should be put into the wallet on your P2Pool node.
[/quote]