Originally Posted by
BobbyG
I'm assuming the magnet doesn't interfere with the phone. However, my wife has a phone case with a magnetic clasp and it seems to have interfered with the touch screen, rendering it intermittent. We changed back to her old non-magnetic case and the problem disappeared. It's an LG G3.
A magnet will not interfere with the display itself, nor the any of the phone electronics except if it has a compass/magnetic field sensor.
In your case the LG G3 probably has the magnetic sleep feature, a tiny sensor that puts the phone to sleep when the case is closed and the magnet was close enough to confuse it.
Maybe ironically, I have clipped the magnetic clasp off on my wife's phone case and replaced it with velcro. She was worried about it, or has the sensor or something - easier to just change it than troubleshoot a problem if any.