Some things are not working properly


I’m programming the localized vacuum cleaner exercise in local backend.
The “Reset” button freezes the browser and gives the following error: “broken pipe”. The “Load in robot” button sometimes never ends loading so I can’t keep going without refreshing the browser, the problem here is that I’ve lost some lines of work more than once and that I can’t test programs with these issues because every test takes me like 5 or 10 minutes.
As these things are not working, I can’t finish my exercise, please help. These problems appear using both firefox and chrome browsers.

Unai Sanz.