Stream goes sometimes under 60 fps but fps in game are good.

[Rabbit0994]

Hello guys, first of all i want apologize my english. But my problem is that i set 720p 60fps in OBS but stream goes sometimes under 60fps like every 2minutes and it looks like 30fps. And after few second it goes normal back. I tried everything, what i found in internet but nothing worked. In CS:GO for example i have good FPS and usage of GPU and CPU is low so there is no overload on this hardware. But i use monitore capture cause cs:go doesn t work in game capture but i tried for example Lost Ark in game capture and it happens there too.

MY PC:
CPU:AMD Ryen 5 2600
GPU:GTX 1070 8GB
RAM:16GB
SSD:250GB

Here is my log file:https://obsproject.com/logs/y9R1iLZbzelPomQK


OBS settings:
Base resolution:1280x720
Output resolution:1280x720
Downscale filter:Bilinear
FPS:60
Encoder:NVIDIA Nvenc H.264 (new)
Bitrate 3500
Preset:Performance
Profile:High
Max B frame:2

And im not twitchpartner so can it be problem that i want stream in 720p 60fps? Or nonpartners can stream in 60fps too?

Thanks for the help.