Facing these issues for several months on Huawei Y7 Prime 2019 Android 8.1. Phone doesn't ring in incoming calls. I cannot hear the voice of the caller in incoming and outgoing calls. Calls on WhatsApp, etc works fine. The ringtones setting show empty list. When I open it for sometime the list shows up and I can select a ringtone. Then calls ring and voice comes for a few minutes or hours and then again this issue arises. Also I cannot attach files anywhere, Gmail, WhatsApp, Google, nowhere. When I select the files option it opens files for a second and then exits. Also Camera crashes while taking pictures and screen shot doesn't save except when I clear gallery data and open the app. After a few minutes again same problem starts. Please suggest solutions. These all issues seem interconnected.