Did you find a solution? I have the same issue with ctrl+f . I tried another keyboard and even installed an older version of afterburner
Some Details:
(Notebook) Windows 10 Pro v1709 from 2018-03-23,
Graphics driver 391.35 (nVidia original)
Gtx 970M
MSI Afterburner versions 4.3.0 (2016) and 4.4.0 (2017), not both installed simultaneously ofc
My Card started thermal throttling with heavy load lately, maybe cooling getting old. With the given voltage-bar I can just increase the voltage and not reduce it.
I cleaned it from dust but I'm afraid of destroying that crazy type of cooler-pipe-array-thingy distributed over the whole mainboard if I remove it.