Strong electric magnetic fields can corrupt data. The magnets used in the old hard drives are shielded to prevent this from happening. Strong magnets were used to bulk erase the old hard drives.

To isolate the problem try this:
1. Shoot a few photos of your house, anything for that matter, on three separate cards.
- Check that you can see / review the images prior to moving on.
2. Place the card that has been giving you issues in a safe place in you home.
3. Place a second card in a metal box.
4. Leave the last, third card in the camera.
5. Put the camera and the metal box on the floor in the same place where you suspect the problem.
6. Go for a ride, start, stop, turn the car on / off a few times, accelerate as that might generate the EMF.
7. Go home and reevaluate the cards;
- if the card in the camera is corrupted, but not the one in the metal box that points to EMF.
- if both cards in the car are damaged it still could be EMF, but heat or vibration would also be suspect.
- if the card left at home is corrupt but not the other two in the car, then that card is going bad.
- if all three have issues it's probably the camera.

Let us know how you make out, I am curious to hear about the results.

Another thing you can do would be to have someone sit in the back of the car with one of those ball compasses in liquid that float. Get a read on North prior to starting the car. Then keep the compass near the place where you are having the problem and see if the compass goes crazy, spinning in different directions when starting, stopping... make sure you are driving in a straight line. If the compass is doing strange stuff you have magnetic fields in the car.

My wife and I frequently take short hikes in the Sierras. Three hikes ago, after taking a couple photos, I got an error when trying to view my photos. I formatted the card and everything then seemed OK. Two hike ago I had a similar thing happen.
My wife’s car is a Tesla and I wondered if the battery was corrupting the card when I placed my camera on the floorboard for the trip. So, yesterday, I took a photo, placed the camera on the floorboard and we drove to our hike. On arrival, I could not view the photo, so I formatted the card and all was OK again.
I am thinking the close proximity of the camera and the car battery of the Electric Vehicle is corrupting the card. At any rate, if you have an electric powered car, this is something to think about.

An unshielded electro magnet (maybe in the drive train/electric motor may be doing it. Magnetism can screw up memory cards. A friend who is a Professor of Computer science had a student whose disks/drives she turned in were often corrupted so he questioned her about how she handled them. The ones she had her homework on were put on the refrigerator with a magnet so she would see them and remember to take them to school when she fixed her morning coffee. She stopped doing that and the problem was solved.

Maybe that Tesla doesn't have very good shielding.

That bit about magnetism or electric fields not affecting memory cards doesn't seem to hold up all the time in the real world.