Wechat pull-down applet inexplicably increased.

Or use mobile phone antivirus software to kill virus, which may be poisoned, so automatically jumping out of WeChat applet is like this. If all else fails, you can take it to the mobile phone shop.

It could also be junk advertising. Wechat will automatically pop up some junk applet games, which may be related to your usual playing games or using software, because some software has game advertisements.