Basically the same response I got from them too...
Thank you for contacting Samsung Customer Care.
I understand that the picture brightness of your TV pops or dims automatically. You would like us to release a firmware to fix the issue.
I sincerely apologize for the inconvenience and would be glad to assist you.
I am sorry but I do not have access to third party websites. I appreciate your efforts in troubleshooting the issue. As you have already performed reset on the TV and changed some settings but still experience the same issue, I recommend you download the firmware version of the TV by visiting the link given below:
Before updating the firmware version of your TV, please check the firmware version installed on your TV by following the steps given below:
Menu >> Support >> Contact Samsung.
We apologize that the PN60F5500AFXZC is not showing on the support website. We will contact the proper department to research the issue.
We hope we’ve answered your inquiry. Please let us know if there are any additional questions or concerns.
You can also visit our How To & FAQ >section on the website for more product information.
We deeply value your loyalty to Samsung and are committed to provide you with the highest level of customer
service. If for any reason the information we provided did not resolve your issue, we have various
contact channels that are available to assist in resolving your concern
For immediate assistance with a live agent, you can chat with us here
For support by phone, you can reach us at 1-800-SAMSUNG(726-7864)
Samsung’s Social Media Team is available to assist with providing up-to-date information or answering questions.
Visit us on Facebook
Visit us on Twitter
Thank you for being a Samsung Customer!
Samsung Customer Care
So is this firmware the firmware t hat we already updated our tvs with through the tv itself or is this a newer version? Doesn't seem to be anyway to tell.