Limited TiVo Suggestions

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I have a TiVo HD and for years it has been creating a diverse set of TiVo Suggestions. Awhile back we were away and the disk became nearly full of recorded shows, so no Suggestions were recorded. After we watched and deleted the recorded shows, we realized that there were still no Suggestions being added. I have tried the solutions here: 1. Rebooting to set Suggestions off and then again to set them on; and 2. Resetting the Thumbs ratings and then recreating them. That has resulted in a few Suggestions being recorded, but they are limited to additional back episodes of shows to which we have Season Passes. There are no Suggestions based on movies or other one-time recordings, which is a big disappointment since we felt that previously the Suggestions which were recorded were a good cross-section of our interests as expressed in all of our recordings. What can I do to get TiVo Suggestions to behave as it did previously and record a wider range of shows?