What Kiki said is spot-on.
I haven't found any incubator to be suitable for just any location in a house. It needs to be a sheltered, low draft area. A kitchen counter is going to have different temperatures coming at it from all directions in most house designs. If it's a stone counter, that's a lot of cold thermal mass working against the heating unit. There's also the chance of cooking fumes posing problems for the eggs.
The biggest con to the NR360 is the lid. It's very difficult to line up when closing. I have 2 and they are different in the way they need to be handled to close fully. With one I can just set the lid in approximately the right place and nudge each side at the top and it falls into place properly. With the second I have to hold the lid at an angle to line up the little notch in the lid with the tab on the tray, starting at the back and then getting the front into place. A little wiggle with two hands on the top to confirm it's right.
So, are you certain your lid is closing properly?
Everything else about the incubator makes the lid issue worth the hassle IMO. But if it's not for you, that's your call.
To help eggs roll smoothly, I like to use a rubber shelf liner cut to fit the bottom, there's plenty of clearance for the turner. The first hatch I used it without a liner, eggs would kind of "roll back" in their cells after being turned, the movement was so jerky, and it sounded like bowling balls. With the liner everything stays where it's put and it's quiet.
It's also entirely possible to get a faulty unit. That happens sometimes with every electronic device, there's no reason it wouldn't with an incubator. If it can't hold temperature within the correct range despite choosing a good location, try giving
MannaPro a call.