S40 steering wheel vibrates at super low speed( below 10mph )
 

Hello guys, :)
My car is S40 2.4i '07. Been driven 55000 miles.

I feel excessive vibration on my steering wheel, at low speed, on certain anti-slip surface such as these :
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It's worse when I have my wheels turned to far-end.
On the other surfaces, it's totally fine. Even at highspeed it's calm as new.

Should it be the sign somewhere needs to be repaired?
I'm afraid the surface could do any harm or extra load on my vehicle.

Many thanks, ;)

Is it a low frequency or a high frequency vibration in the steering wheel? High frequency means it shakes quicker - like a vibrator, while low means it gives more like kicks in the steering wheel.

Do you get any sounds with it?

Also, give this a watch - lots of good generic info, timestamp 2:30 has some blurbs about steering wheel movement but the whole thing is good.