Why does my Site lose connectivity, consistently, after about 30mins use? I have to stop and restart my website (within local) to carry on working?

Thanks for the prompt reply Clay. I am using windows 10 x64. This is the error return:

Local Router Error

Our apologies for the inconvenience. The Local router is not able to connect to the site you requested.

We suggest you try the following:

Restart Site - Go to the Local by Flywheel app and restart the site you are attempting to access.
Contact us - If the issue persists please contact us.

The error occurs whenever I try and update or activate plugins and/or themes. I’m not sure what happened or where it happened. I have Bitdefender installed. I stopped it (completely) but same problem.