Retain trigger not working with WPA2

Hey guys. So when I use hashcat for MD5 or MD4 etc, the retainer works as supposed to and my GPU does not go above 75°. When I want to crack WPA2 howerver, using a 15GB wordlist, my GPU will go above 75° up to 90° and hashcat will stop. I tried using the minimum workload setting, which did nothing. I also tried setting the retain trigger to 65°, which did nothing either. Any tipps? 

Specs: 

Windows 10 Pro x64
CPU: Intel Core i5 4670k @ 4.5GHz
RAM: G.Skill TridentX 16GB, DDR3-2400
GPU: MSI Radeon R9 390
Motherboard: ASrock Fatal1ty z87 Killer
PSU: EVGA 650 GQ

(Don't worry, I use Linux for capturing and cracking on the go )