It seems to refuse translations ("can't translate at this time" error) if you are not logged in to a deepL account. At least for a few minutes, not sure what triggers it.
Sorry to hear that the extension hasn't worked well for you. We would appreciate if you could share more information about the issues you’re experiencing through this form: https://support.deepl.com/hc/en-us/requests/new. Please note that you will need a DeepL account to file support tickets.
