I'm running Knoppix 5.1 Live CD with an 8GB Everex USB stick on my Thinkpad T43.
All of the time the stick can be mounted and switched to read/write, no problem.

The stick has a short simple name USB8GB.

BUT! Some of the time the USB stick flips back to read only (can take 5-30 minutes but never longer).

I don't see the same issue on my home PC with OpenSuse or on Windows XP, so the hardware is OK...

Any ideas how to stop this happening?