[freenet-support] CPU at 100 %, frequent restarts needed

Some time ago, I had to restart my node once every two weeks or so,
because its CPU consumption would grow over time -- and after reaching
90 % or more rendering the computer useless.
However, lately these things occur very often. The node starts
consuming more and more CPU resources, pushing it to 100 % all
together, and this happens at least once every 1-2 days. What's the
deal here? Is it due to the latest Java version, or are there other
causes?
An evil plot to get rid of us who still use version 0.5? :)