Unattended Assist installations not staying connected

Hi,

Has anybody else had the issue where after installing the unattended client, the computer very rarely, or mostly never actually shows as available.
This is the same situation on many PC's for me, and I know they are online as I have been able to get remote access using the manual remote session without issue.
I'm using Windows 8.1 with Firefox and the Firefox Plugin, client PC's are a mixture of Windows 7 and Windows 8.1 machines.

Any help will be much appreciated.

Thanks

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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,