Yep.
There is functionality in vCO responsible for renewing the token. Unfortunately in 5.5.1 this functionality got disabled and tokens are not properly renewed after they are about to expire.
There is already fix in place that will be available in vCO 5.5.2. Possible workaround is to periodically restart the task providing the credentials or file a ticket to GSS and there is patch available. I will check if this can be released in form of KB article so that it is publicly available.
Hope it helps , Ivo.