What should I do if the background of Samsung mobile phone is closed after running for a period of time with Meituan Takeaway Merchant Edition?

If the background program of the mobile phone is automatically turned off, I suggest you: 1. Check whether the third-party security housekeeper software has been downloaded recently. 2. View Settings-(General/More)-Developer Options-Do not keep the activity and restrict the background process from turning on or off, and then try (some machines are hidden when they leave the factory, so this operation can be ignored if they are not activated). 3. After opening the software, don't click the back button, click the Home button to test whether the software is automatically closed. 4. If the problem still exists, please back up the data (contacts, text messages, photos, etc. ) and try to restore the factory settings.