Hello! Maybe the phone is poisoned. At this time, you can try to use anti-virus software to kill viruses (maybe not), uninstall suspicious software, and prohibit some software from networking. Secondly, back up the data on the mobile phone, restore the factory settings, and see if it can be solved. If it still doesn't work, try to brush the machine if you can. (PS: data is priceless, so make a good backup before operation to avoid irrecoverable loss)