Denon DVD-2910 excessive vibration?

Just bought a new 2910.
It started whining (high pitched sound) on track three.
The noise, a mechanical resonance, lasted about two minutes.
The whine really stood out whenever the music had a similar frequency (a glaring distortion).
I tried putting some sorbothane pucks on the player but it didn't help.
It was late night listening (low volume) which may be why I noticed.
Thinking I may have to return this pup...

No vibration problems with the Denon 3910 that I am aware of. I have owned both Denon 2900 (not 2910) and Denon 3910 players. My Denon 2900 vibrated like an old electric football game.

Can anyone tell me why I can't access DVD subtitles on my new 2910?
The option is "grayed out" on the menu indicating unavailability.
I'm using HDMI connection -Is this why?
I've searched all menus but no subtitles.
Also, manual isn't very helpful.

I've had the player less than a week and its performance
isn't impressing me much.
Slo-mo forward and reverse is very jerky compared to Sony.
It has 12-bit video processing which shaped my expectations upward.
Also, unit has a problem remembering where to resume when turned back on (playback point selected randomly).

'Till now, I've only used Sony products for DVD.
Did I make a mistake going with Denon?