I started facing a few issues post updating the Nokia 7 Plus device to android 9
1. In call volume becomes as good as inaudible many times even when the in call volume is at max.
2. My unlocking pattern randomly becomes visible even when it is set not to be visible.
3. A specific problem with whatsapp. Sometimes when I tap on a contact from chat list, it dials a whatsapp call on that number instead of opening the chat.
4. Battery performance has downgraded
5. Sometimes the phone gets overheated during charging and I get a notification that phone temperature is beyond permissible level and that I should stop charging.