today i turned zorin connect extension only , then screen started stopping after 4 min ... u can see screen recording via below link
https://drive.google.com/file/d/17d-dkdm2k85e7K_eJ34wJ2Y-_HPkvQXJ/view?usp=sharing
... and also after turning of (zorin connect ) ...pc started working smoothly as normal
@AZorin I believe milesdredd has just reported a bug you should know about with Zorin Connect. milesdredd has isolated the issue that they are having to Zorin Connect extension, it is causing this person screen issues. Hopefully there can be a resolution soon.
In the meantime, you may test whether reinstalling the extension helps:
sudo apt install --reinstall zorin-connect
I think it works ....
May be temporarily or permanently...
Its been 5minute .... Till now no lag
I reinstalled zorin connect and enabled it
I'll inform if lag occur again 
Thanks for help 
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