There's a known issue with the Trinket and USB-3 ports. Sometimes they work, sometimes they don't. USB-2 ports seem to be less finicky.
The "recognized over and over" thing is a side effect of the Trinket's bootloader and recent Windows device recognition. The Trinket doesn't have an actual USB interface, the bootloader emulates a USB connection. The bootloader stops running after 10 seconds and passes control to the loaded sketch, and when that happens the USB emulation goes away. Windows sees that as a USB device being plugged in and pulled out over and over, so it keeps chiming away every few seconds.
5V Trinket not bootloading
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- adafruit_support_mike
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Re: 5V Trinket not bootloading
I ended up ordering some tiny85-20SU ICs on eBay and replaced the mcu. A quick bootloader repair and it works fine now. I did manage to damage a trace when desoldering the SOP-8, but some fine wire and solder globs fixed that.
Please be positive and constructive with your questions and comments.