Touchscreen stops working (fix: lock screen - unlock screen)

REPRODUCIBILITY (% or how often): 50%
BUILD ID = OS VERSION (Settings > About product): 4.0.1.48
HARDWARE (XA2, Xperia 10…): XA2 Plus
UI LANGUAGE: Russian
REGRESSION: (compared to previous public release: Yes, No, ?): 3.4.0

DESCRIPTION: Quite often, after unlocking the screen, the touchscreen stops working (fix: lock screen - unlock screen)

PRECONDITIONS:

STEPS TO REPRODUCE:

  1. unlock screen (by pushing the button or opening the magnetic cover)
  2. touchscreen quite often stops working

EXPECTED RESULT: Touchscreen stops working

ACTUAL RESULT: Touchscreen working

ADDITIONAL INFORMATION: