I'm confused (not unusual this early in the morning, and I drink Oren's coffee, not Starbucks). You said that this occurs on both computers, correct? Does it occur only with that particular flash drive? If so, that would indicate that the flash drive is defective.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365