Nov 2024 MacBook Pro (Apple M4 Pro) keeps dropping internet wifi connection

I just purchased a new M4 Pro MacBook, running the up-to-date OS. I used Time Machine to pull the content over from a 2-year-old MacBook Pro. When I connected to my wifi, one of two things happens:

1.) It will connect for a short period of time at atypically slow speeds and then drops connection entirely.

2.) It will not connect to wifi at all.

With the Spectrum wireless, all the other older Apple devices (iPad Pro 6 gen, iPhone 13 pro, iPhone 16 pro) as well as my wife's PC will clock speeds over 400 Mbps and work reliably. The new M4 MBPro will clock between .4-40 Mbps. When the connection drops, I can toggle off and then on the wifi, and it will work at a slow speed for an undetermined amount of time.

To date I have:

1.) Restarted the MBPro.

2.) Rebooted the router.

3.) Created a second account and had the same issue.

4.) Reinstalled the OS.

5.) Ran a computer diagnostic at the Apple store (no problems found)

6.)Reset the computer started anew without using the time machine backup (in case something in the backup was causing an issue).

We have other devices in our house (PC's, older Apple TV's, Smart TV's...) Nothing else is having the issue. The older MBPro didn't have the issue.

I am frustrated with the experience and am not sure what to do next. Did Apple make a computer that will not work with an 18-month-old modem?

Any suggestions that can be provided will be appreciated. Thanks friends.