Hello patchypatches,
Thanks for posting in the Apple Support Communities. We're happy to look into this with you.
We'd like to clarify; when you say the #3 remains on the screen, are you referring to your keyboard or something else? If so, what app is bringing up the keyboard for use when this happens?
Would you please let us know which iPhone model and iOS version you have installed? This is in Settings > General > About.
If you haven't done so yet, you might try quitting the Voice Memos app to see if that is helpful, as it will all the app to full close and refresh when opened back up. The article below will guide you through this process.
Close an app on your iPhone or iPod touch - Apple Support
You mentioned letting your iPhone rest. Is it getting hot during your recordings? If so, are you receiving any heat warnings? You can read about iPhone temperatures in the following link, and we've provided information on what to expect if this occurs down below, as it could cause some unexpected behaviors to occur.
If your iPhone or iPad gets too hot or too cold - Apple Support
If your device gets too warm
iOS and iPadOS devices have built-in protections to prevent overheating. If the interior temperature of your device exceeds the normal operating range, your device will protect its internal components by attempting to regulate its temperature.
Avoid these conditions and activities because they might change the performance of your device:
- Leaving your device in a car on a hot day.
- Leaving your device in direct sunlight for an extended period of time.
- Using certain features in hot conditions or direct sunlight for an extended period of time, such as GPS tracking or navigation in a car, playing a graphics-intensive game, or using augmented-reality apps.
If the interior temperature of your device exceeds the normal operating range, you might notice these changes:
- Charging, including wireless charging, slows or stops.
- The display dims or goes black.
- Cellular radios enter a low-power state. The signal might weaken during this time.
- The camera flash is temporarily disabled.
- Performance slows with graphics-intensive or augmented-reality apps or features.
Additionally, if you're navigating, your device might show this alert and turn off the display: "Temperature: iPhone needs to cool down." Navigation still provides audible turn-by-turn directions. When approaching a turn, the display will illuminate to guide you through the turn.
Best regards.
