Try checking the sound output or quality using a Bluetooth headphone or wired headphone.The same thing will be applicable to the earpiece as well.Make sure that there is no physical damage that happened to the speaker.If any liquid or dust particle visible, try to clean that with a dry microfiber cloth. Some times low storage space can offer a low-quality image.
Search for the software update on your handset.Additionally, you can also change the wall socket to charge your handset.For the slow charging or overheating while charging issues, make sure to check whether the charger is working fine or not.You can also use battery saving mode from the Settings menu -> Battery.Try lowering the display brightness or set it to automatic mode.You can also use Airplane mode while charging your handset.Once the 100% charge completed, plug out the charger quickly. Keep your phone in a cooler place and avoid direct sunlight, inside a car, etc where the heat gets higher.Simply disable or uninstall those apps from your phone and try to use alternative apps. Search for all the third-party unused or rogue apps that can damage your battery health easily.If yes, then switch off your device and rush to the service centre to replace the battery first. Make sure that the battery liquid isn’t leaking or there isn’t any physical damage that happened to the battery.For the newly purchased users, we will recommend to visit the service centre with an invoice and ask for battery replacement (if within warranty). If the battery health isn’t good enough or low then you should replace the device battery without a second thought. First of all, you should check whether the battery health is good or okay enough.This process can also delete all the internal storage data. Alternatively, you can directly perform a factory reset your device in order to clean all the temporary files and third-party apps.
Try to uninstall or disable unused apps on your device in order to clear the RAM and free up some storage.Some times the pending app updates can also cause frame drops or performance drops. Make sure that all the third-party installed apps or games are fully updated.You can boot your handset in the stock recovery mode in order to clear the cache from your device.Simply soft reboot your phone in order to fix the performance or glitch related issues quickly in most cases.
If not, download and install the software update on a priority basis.
If not fixed, then try to delete all the previously paired device list from the Settings menu -> Bluetooth. In that case, disconnect all the running Bluetooth searching or pairing processes and reboot your handset.
If not fixed, then boot your device in safe mode and check for the issue. Therefore, you should reboot your smartphone at first. In some cases, the Bluetooth connectivity won’t turn on/off.Try sending or receiving the data or files using Bluetooth in multiple phases so the process will become shorter and less time-consuming.If in case, your handset isn’t discoverable on someone’s phone even after enabling Bluetooth connectivity, then make sure you’ve turned on visibility mode.As this article is based on Galaxy A21s, some of the tricks will be only applicable to the Galaxy A21s model. So, the process will be the same for both the new and old models. There are plenty of issues or errors available that can happen on your handset whether you’re using a new phone or an older one. Sensor Issue Fix Samsung Galaxy A21s troubleshooting: Common Problems and Fixes