I hope I'm posting in the right community, and that someone can help me out. For the past couple days, my Samsung Galaxy S22 phone has started playing the default [Verizon notification sound](https://youtu.be/h3QlWGGxQvo) about once per day. I haven't nailed down the exact time, but it seems to happen in the morning. The weird part(s)? My phone is on vibrate, and no notification seems to correspond to it. My phone is sitting on the desk, and I hear the sound, so I check my notifications, but nothing new shows up. I check my [Notification Log app](https://play.google.com/store/apps/details?id=org.hcilab.projects.nlog), and it doesn't show any new notifications. I check Settings > Notifications > Advanced Settings > Notification History, and it doesn't show anything either. Today, I've changed my default notification ringtone to see if the new sound is triggered the next time. I'll update if/when that happens. I'm a little concerned that the unexpected behavior could be malware or something, but I'm hoping something is just bugged. Additional info that could be relevant: a couple months ago, I had to install the Libre Free app, and it was constantly making notification sounds, despite my phone being on vibrate. The unattributed notification sounds didn't start until after I stopped using the Libre app. I haven't uninstalled it yet, but I'm definitely considering it as part of my troubleshooting. Ideally, I'd like to get to the bottom of this without a major reset of my phone. Does anyone have any tips/ideas?