Rainbow beachball spinning forever on login screen after overnight sleep

buckeyes20 wrote:

new 16inch MacBook Pro early this week.

—after a nightlong sleep the Mac stuck at the login screen with rainbow beachball spinning forever,

—also have the problem with slow password typing ... when a wake-up is successful, especially with external monitor plugged in.

You can Try resetting the SMC https://support.apple.com/en-us/HT201295

Also even thought his is a different issue/different Mac I would try this charging protocol and see if it makes a difference:

hthttps://support.apple.com/en-us/HT210615

a long shot, maybe.

You do have a limited 14-day to return for a full refund or exhange for one that works without issue.

You also have 90 days of call in support, this is a one on one with Apple tech Support—in an effort to resolve your issue: https://support.apple.com/my-support I would take advantage of this resource.

The holiday return period is in effect, if you purchased it from Apple online or from an Apple StorePurchases made between November 15 and December 25 —can be returned through January 8. See: Returns & Refunds - Shopping Help - Apple

https://www.apple.com/shop/help/returns_refund