Why does the mobile app I often use not respond when I use it and then need to wait or restart?

According to my judgment, there are two reasons: 1. There is too much rubbish in the mobile phone. It is suggested to open Settings > Application Management > Problem Software > Save > Delete data, and then restart the phone (different phones may use different words, so you should figure it out yourself). 2. If it still doesn't work, I suggest you turn on the safe mode of the mobile phone, restart the mobile phone, and press and hold the volume down button until it is turned on. Some mobile phones say it's up to you to press the multi-function menu button. If the application is found missing, it means that the application is not official. Recommend to download the official one again. As for turning off the safe mode and restarting the phone, the safe mode will be displayed on the safe mode screen. I'm exhausted from playing so much. I hope to adopt.