RSS Feed not working anymore

Pinterest's RSS stops working after a while and the account no longer updates or posts pins.
Already sent dozens of tickets to the Californian Lords of the web, who obviously do not even deign to respond.
Suggestions?

Are you sure your feed is (still) using your claimed site as target links? If not, then that will definitely mean Pinterest will ignore the feeds items. If you are, then maybe make sure the item links have unique guid's. I've found that that greatly influences what and how many items Pinterest deem appropriate to post.

As for sending tickets...yeah they do have a unique take on support i.e. ignore them and they'll go away