Possible account hacked, including two factor authentication tfa

Hi. I turned my PC on two days ago and suddenly an unattended Zoho Assist session started. I am the only person with access, so I shut down Zoho Assist and instantly changed my password and added two factor authentication. I just turned my PC on this evening and the same thing happened. How is this possible with TFA? Could Zoho themselves have been hacked?

Nick.

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,