Agree, that in LOG there is nothing special.
I tried to catch this BUG abt 2 months, but nothing in log :)
As I remember, on Stable#5 it reproduced more (could be 5-10 times per day) than on Stable#7.
On Stable#8, little better than S#7.
Today it unmounted 2 times.
Yesterday 1 time.
I will...