why it doing this.

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It could be the carpet. With some very dense plushes and depending on the direction you are vacuuming the machine will skip / bounce. This will also happen on carpets with large dense yarn loops.

Try vacuuming Astro turf some time the machines will do that and or the machines are hard to push. One place I worked 20 yrs ago had an area of the astro turf and a sanitaire vacuum. Oh how I hated that stuff.
 
Don't go against the grain...

Berber and other tightly-looped carpeting will often cause what you describe.  Because of the way it's woven, most carpeting has a "grain" to it, which when it's laid usually corresponds to the long-direction of the room when it comes off the loom.   You can easily tell by lightly brushing your hand across the carpeting.  In one direction it will feel smooth and the nap will lie down as you brush it.  Going the opposite direction you'll feel the nap bristle a bit against your hand.  Vacuuming "against the grain" will sometimes cause the nozzle to "chatter" or skip.  Once you've determined the north-south direction of the nap, try vacuuming as much as you can going east-west and you'll avoid the problem.  This was part of carpet selling 101 back when I worked in home furnishings.
 
Can you believe that a carpet installer told me that carpet doesn't have a direction.

At that Point I told him I have been doing commercial cleaning and carpet cleaning for over 20 yrs and walked away and found another installer to put down the new carpet in my apt. I guess just becouse I'm an apt. dweller that made me an idiot in his opinion.

I questioned how they were going to install the carpet and why so many seams when only 2 were required. one where the hall and living room meet and one where the bedroom and hallway meet. Their intention was to seam the carpet at the far end of each room and each room would have ended up with 3 pieces to carpet. The next installer did it the way it should be. 2 seams as described above. Had it been done the other way the carpet nap/direction would have been wrong.
 
OH!

Hey Joel

How have you been?

When I use my Rainbow PN, it does the same thing (skips) on my berber if I go a certain direction with it. The Kenmore PN on my Kenmore canister doesn't do it. I have to go the opposite direction and it's really smooth. I've always wondered why my Rainbow PN skipped on the carpet but the other doesn't.
 
The brushroll isn't skipping.  It's the shape/design of the nozzle plate itself and how well it glides vs gripping/snagging on the carpet nap.  Some nozzles will do it more than others.  Even some straight suction nozzles will skip.  Try reducing the suction a bit, if the vacuum you're using allows that to see if that makes a little difference.
 
Here's another possible reason that hasn't been mentioned. Check the wear on the rear wheels- those quickly wear down if a former user buried the head in the carpet constantly.
 

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