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Please do try https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may also need to insert your earphones and or hook up to a laptop. No need to launch anything, just turn it on.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb.
Samsung Gear s³ Frontier Watch.
Samsung Galaxy Watch⁴ Classic.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.
Reboot the phone and it should start working ok again although it will happen again at some point.
Yea I know it happens again but for me it goes away for a day or two before I need to reboot my phone again. It's a bug in the January update and nothing else you do will fix it on a permanent basis.
There is a also a lag issue with the Galaxy Watch 4 when you turn on the following setting:
Watch settings > Accessibility > Visibility enhancements > Magnification
Enable the above and try entering your PIN, Dial a phone number and there is a 1-2 second lag on every key press!