Try wiping the "cache partition" to see if that helps. It's safe and won't remove your settings or app files. Clearing the "cache partition" can help resolve any issues caused by old or corrupted system cache data.
Follow the steps below,
Clear the cache partition - Turn the phone off (shut down) - Press and hold the Volume Up key, then press and hold the side key. - When the Android system recovery menu options show release buttons. - Press the volume down key several times to highlight wipe cache partition. - Press the side key to select. - Press the volume down key to highlight yes, then press the side key to select. - When the wipe cache partition is complete, Reboot system is now highlighted. - Press the side key to restart the device.
Also, clear gallery cache To clear the cache of the Gallery app on your device, go to Settings, select Apps, find the Gallery app, tap on Storage, and then choose Clear Cache.
