Local Router Error - fix?

About every other time I start up Flywheel, I get the following error when trying to open the admin or ‘view site’. I haven’t got the slightest idea what’s causing this-- restarting seems to fix the issue but I’d rather not have to to do that repeatedly. Any ideas on how to fix this?

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.