Press Shift + F3
Community Feedback #3 says opening and closing the Epic overlay should restore keyboard input.
Hell Let Loose: VietnamUnofficial News & Community HubSOURCE-AWARE ISSUE GUIDE
Community Feedback #3 identifies some keyboard-freeze cases as an Epic Online Services overlay issue. The named workaround is Shift + F3 to open and close the Epic overlay. It is not a complete client-side repair; Epic is described as working on an EOS SDK update.
QUICK ANSWER
Community Feedback #3 says keyboard input can stop responding while mouse input continues, and the investigation identified the Epic Online Services overlay. Affected players can press Shift + F3 to open and close the Epic overlay, which should restore keyboard input. Status is awaiting an Epic Online Services update.
SOURCE POSITION
Community Feedback #3 says keyboard input can stop responding while mouse input continues, and the investigation identified the Epic Online Services overlay. Affected players can press Shift + F3 to open and close the Epic overlay, which should restore keyboard input. Status is awaiting an Epic Online Services update.
MATCH THE SYMPTOM

CHOOSE YOUR CURRENT STATE
A mouse that still works plus a dead keyboard is the named Epic overlay path.
Community Feedback #3 says opening and closing the Epic overlay should restore keyboard input.
Do not disable security software as a first response.
Patch 1.4 separately says keybindings save only when you choose Apply.
REVERSIBLE CHECKS FIRST
Confirm the mouse still works and only keyboard input is missing before treating this as a crash or bind-save problem.
Press Shift + F3 once to open and close the Epic overlay, then test movement and a single action key.
If the overlay does not appear, try the same combination after releasing other modifiers; do not remap random keys first.
If input returns, note the map, mode and what you were doing immediately before the freeze.
If input does not return, alt-tab once, retry Shift + F3, then restart the client only after those reversible checks.
Report remaining cases with platform, overlay state and whether Shift + F3 restored input.
IMPORTANT LIMITS
QUICK ANSWERS
Community Feedback #3 identifies some of those cases as an Epic Online Services overlay issue. Keyboard input can stop responding while mouse input continues.
Press Shift + F3 to open and close the Epic overlay. Official text says that should restore keyboard input while an Epic Online Services SDK update is awaited.
No complete client-side repair is claimed. Patch 1.4 includes separate keybinding save and remapping fixes. The frozen-keyboard path is still described as awaiting an Epic overlay update.