Well I am lucky in that I seem to get all of the undocumented features.
I have already posted on this in another thread (yesterday?)
I kept getting this message every time I opened my reader after updating to 3.0.0. Did not happen on 2.1.0. I connected to calibre and it went away only to be replaced with a reset every time I powered on. (I did not get a file dirty error/must scan error) Luckily it is a very fast reset taking only about 30 seconds.
I changed books and it started normally several times, so I thought maybe a book related problem although the book worked on my 2.8.1 mini.
Then I let it go to sleep and 1/2 hour later it reset when turning it on. I have to push the power button at least 3 times to even get it to turn on.
Also since 2.10 I have been getting a pseudo cover displayed before the real one for about 10 seconds when going to sleep. In 3.0.0 I still have that and when the home screen displays it first display a cover with two outline boxes and the title in the center, then the real covers show up.
So far my Aura HD has always turned on and/or connect, and even when I was getting the message to please format my card to FAT32 it would display the home screen and I could open the books on the card (all of my books are on the card) with no further problems until next time it woke up grumpy.
BTW this isn't a Windows message it is a message displayed on the Kobo screen and pressing X or OK would let the reader continue on it's normal way.
Helen
PS
The last time it went to sleep it did not get around to displaying the real cover. So I powered on using the increasingly familiar reset procedure, put it to sleep and the real cover showed up again and I was able to power on normally.
I am starting to think it is smarter than I thought and is messing with my head

.
Helen