I've had bugs relating to EMI issues crop up in testing before. The device in question had a compressor mounted inches from the touchscreen. It turned out the E

I've had bugs relating to EMI issues crop up in testing before. The device in question had a compressor mounted inches from the touchscreen. It turned out the EMI from the compressor would generate phantom touch input on the display. It looked like a bug until I added a bunch of debug logging to the device. Even if the computer is behaving predictably, the environment can do a wonderful job of making it go haywire.