I have make a few assumptions here, not a lot of data provided.
** I'm making the assumption that you are playing with uncapped frame rates **
Take a look at your frame rates during these scenes. If your frame rate is extremely high, consider settling a frame rate limit.
Also, need to look at the rate of change for the temps. If the GPU heats up significantly faster than it cools down, especially with high fan rpm, this is an indication that there could be a problem with the cooling solution.
A worst case example would be a bent or warped PCB preventing heatsinks from making solid contact.
Another example, if this an aging card, you may consider replacing heat pads and/or thermal paste.