📺 Samsung Galaxy A34: Why does my screen flicker with colored lines?

My Samsung Galaxy A34 screen has started flickering randomly with thin colored lines appearing for a second or two, mostly when the brightness is low at night. Restarting the phone makes it stop for a while but it always comes back eventually. Is this a software glitch or something wrong with the display itself?

Colored lines and flickering on a Samsung Galaxy A34 can be caused by a software glitch, display driver issue, loose internal connection, or damage to the AMOLED panel. First, restart the phone and install any pending software updates. Try lowering the refresh rate and brightness to see whether the flickering changes. If the lines appear even on the Samsung logo during startup, it is more likely a hardware/display problem. Avoid pressing or bending the screen, as this can worsen the issue. If the problem continues, have the display and internal connectors checked by a qualified technician.