Huawei Mate 40 RS is a high-end smart phone equipped with a powerful processor and Huawei's own operating system. According to your question, if your Huawei Mate 40 RS racing theme special effects are lost, there may be several reasons:

1. Software problem: It may be caused by system update or application problems. It is suggested that you try to reinstall or update related applications, or restore the factory settings of mobile phones to ensure the normal operation of the software.

2. Lack of updates: Huawei will continuously introduce new software updates to fix known problems and improve the performance of mobile phones. Please make sure that your mobile phone system is the latest version to avoid possible problems.

3. Hardware failure: Although this situation is rare, it is still possible. If the above methods still can't solve the problem, I suggest you contact Huawei's after-sales service center for professional technical support.

Generally speaking, according to your specific situation, I suggest you try to reinstall or update related applications first, or restore the factory settings of your mobile phone. If the problem still exists, please contact Huawei after-sales service center for further assistance.