Hi
i had the same problem and it was happening so often i just went back to 6.16
But i had a little bit of a search on the bug reports and found this that i read a while back
Thread it seems that the error could not be reproduced.
Wait for more experinced users then me to reply to you first but if you can reproduce this error then maybe its worth putting on the bug forum.
I will try and reproduce it myself now. As i know it was happening to me every few mins when i was on 6.2