we have 2 Samsung a21 we have tried the update restarting and undoing some setting to try to get it to work the phone works otherwise just being able to swipe to answer the calls, so we wait and call them back but this is inconvenient does this happen to others and will there be a fix
1. Clear your phone's System Cache Files by turning your phone Off and then from a set series of button presses go into the phone's System Files and clear the cache. No information is lost this way. You may need to insert your headphones or hook upto a computer with your data cable to get to this menu on the phone.
If no help then Put the phone in Safe Mode which disables your downloaded app's but let's your stock app's keep working. If the issues stop then this highlights a downloaded app as the possible issue. Come out of Safe Mode and start deleting your most recent downloaded app's one at a time until it stops.