First of all, thanks for the playground! Really nice design and features.
After I have had the website open and idle in the background for some time and I switch back to it, it is no longer responsive. I've had this happen 2 or 3 times now:
- input is no longer checked
- if I refresh the website, it shows an error that the website can no longer be reached:

After refreshing and waiting for long enough (1-2 minutes), the site eventually loads again.
Sorry there's not a more clear definition of what the problem could be - could be anything from the hosting to problems with the connection (although other websites load... π€). If this is not clear enough and you cannot reproduce, then not sure what next steps we can take π