I have the same problem with songtr.ee
The site is a musicians collaborations site, and I've never had any problems with it, until the last Avast update, Avast says the connection was blocked because of URL:Phishing I even tried to add it to the Avast exception list and it's still blocked, the desktop client that connects to that site is also blocked for the same reason.
According to immuniweb I did a 45 second phishing test and it was found to be clean, therefore, the only assumption is that the domain triggered a false positive in Avast.