I'm sorry to hear that you're having this issue.
The fan may need to be replaced, and you may want to have the unit inspected by a service technician. Unfortunately, I can't assist with home repairs, but if you're interested in having it looked at, you can call 800-SAMSUNG or fill out the online service request form here:
I have a Samsung TV that sayes repace Fan # 1 and it shuts down after 5 minutes. also on the front, the green Timer light blinks and Red Stanby Temp light blinks