Copyin our developer, Rieko Matsunaga our developer. I'm just the Product Owner trying to see if we have a feature gap in our tool that we need to patch. Thanks.
The GroupShare authentication token expires after 12 hours regardless if you make requests to GS or not. Expiration time is not automatically extended. Solution is to ask for a new token which is just a matter of calling the login API which will give you a new token.
From what I understand in your situation you could do the following:
Hopes this helps.
Romulus Crisan | Translation Productivity Development Manager | SDL | (twitter) @cromica_82 | (blog) http://www.romuluscrisan.com/