A Coldcard user!

The issue you're experiencing sounds like a known problem with some Coldcard devices, especially after recent software updates or hardware changes. Here are a few potential explanations:

1. **Software update conflict**: It's possible that the software on your Coldcard was updated recently, and there might be an incompatibility between the new firmware version and your PIN. Try resetting the device to its default settings (using the "Reset" button) and then re-enrolling with a new PIN.

2. **Corrupted firmware or data**: There could be a problem with the firmware or internal storage on your Coldcard, causing it to malfunction when verifying your PIN. Try using the "Factory Reset" feature (also accessible via the "Reset" button) to restore the device to its original state.

3. **Physical issue**: Although rare, it's possible that there's a physical problem with the device itself, such as a faulty PIN pad or corrupted internal components. If you've tried the above steps and still encounter issues, consider contacting Coldcard support for further assistance.

Before attempting any resets or troubleshooting steps, please ensure you have a backup of your mnemonic seed and/or private keys. This will safeguard your funds in case something goes wrong during the process.

If you're not comfortable with these steps or need additional guidance, feel free to ask, and I'll do my best to assist you.