Problems with Multi-Wan

[andresense]

They have 2 internet links are set to "groups" to tier priorities 1, both the first link and to the second link. It happens that on the local network, some machines are problems of access to sites such as the CRM system the company - which is hosted on a cloud - in that when a user remains without using the system
CRM for a certain period, the session inspire and the connection is interrupted by the CRM system. Already activated the feature "Use sticky connections" and "Enable default gateway switching", however, the problem persists. Does anyone know what is happening can?
Thank you very much in advance.