Freedom VPN Disabled When Screen is Unlocked

I would prefere to have Freedome on all the time, but when my screen is locked, either through time out or manually hitting the lock button, then when it is unlocked for use, Freedome VPN is disabled (i.e. set to "off") automatically. This happens oven after I have cleared the system cache. Any thoughts...?
Notes:
1) My phone is not a Huwei Honor (yes, I searched for help before posting); it is a Moto X (2nd gen ?)
2) My O/S is Android 5.1, patch level 2016-04-01
3) To best of my knowledge, my phone does not have an app-by-app setting for saving power/battery; also, my global battery saver setting is 'Off'
Comments
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"Please get in touch with our support team via chat or phone here to troubleshoot further."
This is advice is rather difficult to follow, since no one ever answers that phone number (supposedly "closed for the day") and chat service is perpetually telling me that "Chat is currently unavailable."
Do you have any other sage advice?
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