Faulty Spark Plug- Common Problem?

[Three Pedal Steve]

2013 M3 original owner here, with 89k totally trouble-free miles. It had been 37k since the spark plug/trans&diff fluid change service, so I took it to my dealership and they did the work.
Five days later the yellow service engine warning indicator displayed. Took it back to the dealer and they diagnosed a faulty spark plug and replaced it under warranty- no charge.
Now, five days later the service warning indicator has displayed again. Have another appointment with the dealership. My question is: Has anyone heard of a faulty new BMW spark plug?
Maybe there was a bad lot of spark plugs and these things will be failing one at a time. Thoughts?

[roastbeef]

Not really. Maybe your coils are taking a dump. Ask them if the fault is coming back on the same plug.

[Three Pedal Steve]

Originally Posted by roastbeef

Not really. Maybe your coils are taking a dump. Ask them if the fault is coming back on the same plug.

The service order says, "Found misfire cyl 2 present. Swapped coil 2 to cyl 3 and spark plug 2 to cyl 1, after test drive confirmed misfire fault followed to spark plug cyl 1. Removed and replaced spark plug. Cleared fault. Work performed under warranty.

[dparm]

Meh, could be a bad batch or they didn't torque it down properly. I wouldn't sweat it, bad plugs isn't really a "common problem".

[roastbeef]

Originally Posted by Three Pedal Steve

The service order says, "Found misfire cyl 2 present. Swapped coil 2 to cyl 3 and spark plug 2 to cyl 1, after test drive confirmed misfire fault followed to spark plug cyl 1. Removed and replaced spark plug. Cleared fault. Work performed under warranty.

the tech was testing the plug and the coil. sounds like it was just the plug.