I fixed the links to youtube. You had repeated one of them.
This is baffeling. the maxima's don't tend to have a lot of tranny issues. But I do know that the CVT is mostly not serviceable and is usually replaced. Have the dealer look at it. You should still be under warranty
"Nissan CVT Warranty Extension
Nissan has extended the Nissan New Vehicle Limited Warranty for the Continuously Variable Transmission (CVT) to 10 years/120,000 miles (whichever occurs first) for CVT transmission repairs, replacement, and related towing on all 2003-2010 model year Nissan vehicles equipped with the CVT. The remainder of the powertrain warranty coverage for components other than the CVT transmission remains unchanged. All other warranty terms, limitations and conditions otherwise apply.
Please note that this is not a safety recall, and there are no safety issues relating to your Continuously Variable Transmission."
This link also has a phone number to Nissan Consumer affairs. May have to give them a call to get onto the dealer