I removed my USB drive some time ago, with no benefit. Rebooting would take longer for me to clear the message than just waiting it out. The longest I had was about 60 seconds, the most common time interval is 2-3 seconds, though I get 30 second delays at least every 3rd or 4th time I get in the car. I am not sure if getting my butt off the seat and opening and closing the door would provide me much info, as the message could easily clear in that time. I would not know if it was my actions or the car correcting/waking itself up. FYI, I am in frequent communication with Tesla. They asked me to keep a log and submit bug reports through the in-car feature. They confirmed that it is a firmware issue. Fine. Now fix it. It has been 3 months. I do not think it is reasonable for me to continue with this problem for much longer.