YouTube app holds a long wakelock. What app settings can I change to keep it from doing this?

I am using an HTC Evo 4g with Android 2.3.5 Gingerbread. I'm trying to deal with apps which keep my phone from entering sleep mode, and the YouTube app is a major offender. With downloaded apps, usually the fix is to remove the app and find an alternative app that doesn't suck the battery dry. But I want to keep YouTube enabled so I can watch YouTube videos. What settings for the YouTube app can I change to get it to not hold a wake lock for hours on end? Are there any device settings that I can change to help? So far I have disabled "Preload subscriptions", "Preload watch later", "Improve YouTube", and "Notifications" in the YouTube app's settings, but the wake lock still occurs.