I would do a network reset on the system and see how things go.
Go into Setting
Select Network and Internet
Make sure you are under Status in the left
On the Right scroll down and select Network Reset
Read the information and then select Reset Now
Select Yes for the network to be reset and the system to reboot.
The rest before the system reboots may take a few minutes.
Might also try rebooting the modem and router. This will clear the buffer and sometimes help.
Then test speeds and see if that helps with the stuttering.
Go into Setting
Select Network and Internet
Make sure you are under Status in the left
On the Right scroll down and select Network Reset
Read the information and then select Reset Now
Select Yes for the network to be reset and the system to reboot.
The rest before the system reboots may take a few minutes.
Might also try rebooting the modem and router. This will clear the buffer and sometimes help.
Then test speeds and see if that helps with the stuttering.