I've been a happy Fold4 user for almost a year now. Last week it started acting up and it has me genuinely concerned. I've done a settings reset that hasn't helped the sound issue however the screen issue hasn't happened again. I'm about to do a factory wipe.
- Sound will stop working completely at random times. When it happens its permanent until the phone is rebooted. Sound can be played with external speakers, but not through the phone or speaker phone. Same for alerts, spotify, youtube, phone calls. Vibrate does seem to continue working (Do not disturb is NOT turned on). Rebooting the phone resolved the sound issue for a time.
- About once a day, less after the settings reset, the small screen will be black. Using the side key to wake it up will cause a vibration, but nothing on the screen. Opening the phone shows just a black screen. Fiddling with it in the closed state will get the screen to come back eventually. I find plugging in a charger seems to get it to come back the quickest (the battery ISNT dead, plenty of charge). In 5-20 seconds the screen comes back. Screen still stays black when open. Using the small screen I reboot the phone and then both screens work normally again.