Are you having the problem with more than one device?
It it is just one, let's collect some data:
Get the free version of Speccy:
(Look in the upper right for the Download
Latest Version button - Do NOT press the large Start Download button on the upper left!)
Download, Save and Install it. Tell it you do not need CCLEANER. Run Speccy. When it finishes (the little icon in the bottom left will stop moving),
File, Save as Text File, (to your desktop) note the name it gives. OK. Open the file in notepad and delete the line that gives the serial number of your Operating System.
(It will be near the top, 10-20 lines down.) Save the file. Attach the file to your next post. Attaching the log is the best option as it is too big for the forum. Attaching is a multi step process.
First click on More Reply Options
Then scroll down to where you see
Choose File and click on it. Point it at the file and hit Open.
Now click on Attach this file.
Get Process Explorer
Save it to your desktop then run it (Vista or Win7+ - right click and Run As Administrator).
View and check Show Processes From All Users
View, Select Column, check Verified Signer, OK
Options, Verify Image Signatures
Click twice on the CPU column header to sort things by CPU usage with the big hitters at the top.
Wait a full minute then:
File, Save As, Save. Note the file name. Open the file on your desktop and copy and paste the text to a reply.
If it's more than one then usually the ISP can do a loopback test to check things on their side. Also try logging into the Zoom and see if it is reporting any errors.