Then decrease to somewhere low, mine stops at 15.12% waits a while and repeats.
What the f is this?
This is not a very good first experience to new software..
Anyone know how to fix this bs?

See http://board.jdownloader.org/showthread.php?t=5474

(In general it's not a good idea to post the same thing in two threads on the same board. People on this board with the proper authorisations can move items where they belong when they are in the wrong forum)