Increased Lag/Reduced Frame Rate over time only while Live Streaming

[pat.radisich]

I'm having an issue while live streaming. Things start off just fine, but 1-2 hours in, the frame rate slowly drops over time. at 3-4 hours, everything is unplayable, PC borderline freezes. If I stop the live stream, the lag continues. If I restart the PC, everything goes back to normal and I can live stream smoothly again. I've checked temperatures, loading%, memory usage and nothing seems like it's overloading or overheating at any time. CPU usage sits around 20%-30%, GPU 30%-40%, RAM 35%-40%

My PC Specs are:

SilverStone Strider Platinum 650W Power Supply
AMD Ryzen 5 1600X 3.6Ghz (not OC)
ASUS ROG GeForce GTX 1070 Strix Gaming 8GB
Gigabyte AX370 Gaming K3 Motherboard
Corsair Vengeance LED CMU16GX4M2A2666C16R 16GB DDR4

I stream with Streamlabs OBS (lag was way worse with OBS Studio). I use NVENC for encoding (x264 was more laggy) I stream at 4000 bitrate, different bitrates cause the same problem.
never had any issue until 2-3 weeks ago. Any help is appreciated.

 

[Cioby]

Did you try streaming with Nvidia Shadowplay?

Also did you set your power plan to maximum performance and power consumption?

 

[pat.radisich]

I'll try it and see what happens.
Power plan and consumption were already at max performance