I've heard and read about electronic equipment malfunctioning whenever a spirit was present that somehow interfered with the electrical equipment. For example I have heard that during attempts to run a camcorder in a property being investigated by paranormal groups, the batteries of a camcorder would suddenly "go dead", rendering the camcorder useless.
Some years ago I was in the process of taking some listing pictures in a property that was rumored to contain some sort of spirit or energy form. After taking only about half the photos that I had planned on taking, my camera battery suddenly went dead and I could take no more pictures. That had never happened to me before, and this particular time the camera battery was fully charged before starting out.
Oh well, I got out my Dimension Master measuring device and began measuring a room. I was able to measure exactly one room until it quit working. Wow! First my camera, now my measuring tool, what a coincidence. No big deal, I switched to my Strait-Line Sonic Laser Tape. I took about two measurements and it too quit working! Three electronic devices quit working while in the same room of the property! Upon trying each device later in the day away from the property, all three worked just fine, without changing or charging any batteries. Let me say that every time I went into that house I had the strangest feeling. Some areas had a feeling of coldness. I often thought I smelled pipe smoke in some rooms, ladies perfume in other rooms.
Fast forward: Very recently I was waiting on my buyers to show up in order to show a property that was an estate. Of course it was vacant. I was accompanied on this outing with a friend, and we were walking around and turning the lights on. The decor in every room was very dated, very 1950-1960 ish. Once again I had that strange but familiar feeling that a spirit was present. The hairs on my arm were standing up, giving me goose flesh. For some strange reason while I was walking around with my 6-volt Ray-O-Vac lantern, I decided to chant the words from an old scary horror movie "Boo-get-y". I don't know why I did that, other than to remind the other person that I was with at the time that I had this strange feeling of something or someone else being there besides the two of us. After only three or four long drawn out "Boooo- Get- Y"s, my flashlight went out and stopped working! It had NEVER done that before. Needless to say I instantly shut up, realizing that maybe I was committing some sort of act that I shouldn't be.
Did the battery of my flashlight go dead? Maybe, but it was a relatively new battery. Did the bulb burn out? Maybe.... it could happen. Did the switch go bad? Maybe... that too could happen. Anyway, my memory did a flashback to the earlier time when my electronic equipment had suddenly quit working, and I decided I had better knock it off. I got another flash light from my car, and I kept my mouth shut during the rest of the time I was there, including the actual showing appointment after the buyers showed up. When my buyers arrived, they too seemed to sense some sort of weird feeling about the property, and dismissed it as one that would not hold a continuing interest for them. Once outside and in the safety of the bright sunshine, they admitted it was pretty creepy in there.
Wouldn't you know, when I got back home, my 6-volt lantern works perfectly?