Operating System: All
For the past few months, my Release Radar playlist doesn't "reset" back to 30 tracks, only new ones from this week. It's been growing each week, adding the new tracks to the top, and then songs from previous weeks at the bottom. Sometimes it's 70 tracks, sometimes it's 100, but it always includes "old" tracks that make listening to the newer ones difficult.
Here's a screenshot from the desktop version showing today's update: