On/off ringtone and vibrate repeatedly turn themselves back on

Hello,
I've had this issue since I bought the tablet, which is otherwise fantastic: In the sound settings I've turned OFF the "tablet on/off ringtone" and the "vibrate on touch" settings (checkmark removed). The problem is, these settings turn themselves on again, seemingly radomly. I then have to manually removed the checkmarks again.
The ringtone is especially annoying as it bothers my wife and wakes the baby when turning the device on, thinking it will be silent.
I haven't found any mention of this except for this post.
Note: I sent back the first tablet due to this problem. The replacement does it exactly the same, however.
Tablet: Tablet 2-830F
Android 4.4.2
Kernel: 3.10.20-ga0784c9
Build: S000174:140822
Note: on the first one I performed two system updates to the next builds, but this didn't change anything.
Is this issue known and is it being addressed?
Thanks in advance

Very good; I have emailed Lenovo in United Kingdom and sent them a list of a dozen of issues, all I could gather on the last few pages on the forum that seemed important :-)

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