I'm having the same problem using IPV6 proxies from datacenters (Proxy-seller).
The profiles are old and automated for more than 6 months without interruption, and up to 7 days ago they were able to post photos on the timeline normally.
Today some can and some do not, using the same proxies.
A few days ago, some that could not post now have been able to get back, but some that they have been able to get now can no longer.
Has anyone ever been able to define what the problem is in fact, and how to solve it?
Ps .: I do not use jarvee, but its own web application.