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There could be multiple reasons why PyCharm code completion suggestions are not disappearing on their own. Some of the common reasons and their solutions are:

1. Slow computer or large project: If your computer is slow or you are working on a large project, PyCharm may not be able to keep up with the suggestions and may take longer to remove them. In this case, you can turn off code completion suggestions by going to Settings → Editor → General → Code Completion → "Show the documentation pop-up" → uncheck "automatically show the suggestions."

2. Memory management issue: PyCharm may not be able to delete the suggestions due to a memory management issue. In this case, you can try increasing the memory limit by going to Help → Edit Custom VM options and adding the following line: -Xmx<your_memory_limit>G (replace <your_memory_limit> with the amount of memory you want to allocate to PyCharm.)

3. Outdated software version: PyCharm code completion suggestions may not disappear due to an outdated software version. Updating PyCharm to the latest version can resolve the issue.

4. Plugin conflict: Certain plugins may conflict with PyCharm's default settings and cause code completion suggestions to hang. In this case, you can try disabling the plugins one by one to identify the culprit and remove it.

5. Keystroke delay: If there is a delay between typing and the code completion suggestions appearing, it could be because of a keystroke delay. To resolve this, go to IDE Settings → Editor → General → Code Completion and increase the "Autopopup (ms)" value.