It may be possible to organise a return satchel for you in this case, then you can send back the faulty device to be assessed under warranty. You can discuss this with our Tech Support team via the My Optus app, or you can send our social media team a message on Facebook or Twitter.
Did we answer your question? Please mark it as a Accepted Solution and if you see something that was helpful to you or the rest of the community, giving a Kudos is only a click away.
I'm assuming that you're referring to a 4G modem, so I don't know if they are treated differently to Optus' NBN modems, but with Optus' NBN modems they definitely just mail you out a replacement.