Because many of my friends and family are in the Far East I use Line for messaging and for internet video and voice calls. Recently it has stopped, most times, making the 'ding dong' noise when messages arrive, or making the ring tone when calls arrive. Sometimes I get a single 'ding' when a message arrives, but it's very missable. Apart from the lack of notification sounds, all the calls and messages work well. My daughter has also commented to me on the same issue sometimes with Line on her Motorola Android phone. Mine is a Samsung A71 with Android 10, and I'm pretty sure I've got all Android and Line settings correct, but there'so so many I might have missed one. Any ideas please?