I have also encountered your problem. I want to solve it by changing the signature, uninstalling, and restarting, but it is useless. The root of the problem is that you appear on WeChat's restricted list. In layman's terms, it means that you have been reported. You can log in to the official WeChat website and use the self-service method to remove restrictions. If it still doesn't work, call customer service. . . This is how I completely solved it.