My BOINC has begun dropping to exactly 50% once a day with version 58 of Gridcoin running fine. The fix has been as easy as clicking on the task to bring it to the front, staring hard at my monitor, and counting to three. Not sure why it thinks that use 100% of the processor all the time means I want it to take breaks, but there are worse things. I also haven't updated BOINC in a while, so I'm not sure which version is ahead of me or if I'm behind significantly. Everything else seems fine though.