While OBS is closed:
1. One of your audio devices, your mic, has a sample rate that doesn't match the rest. This can result in audio drift over time or sound distortion. Check your audio devices in Windows settings (both Playback and Recording) and ensure the Default Format (under Advanced) is consistent. 48000 Hz is recommended.
OBS Sample Rate:
48000 Hz
Speakers (High Definition Audio Device):
48000 Hz
Microphone (High Definition Audio Device):
44100 Hz
In the Windows search thing, search for: Control Panel > Sound > Recording > Double click on the microphone > Advanced > Try to change the Format to 48000 Hz.
2. In Windows, we recommend that "Game Mode" be enabled. Game Mode can be enabled via the Windows "Settings" app, under Gaming > Game Mode.
Open OBS:
3. Multiple Game Capture sources are usually not needed, and can sometimes interfere with each other (scene 'Scene'). You can use the same Game Capture for all your games. If you change games often, try out the hotkey mode, which lets you press a key to select your active game. If you play games in fullscreen, use 'Capture any fullscreen application' mode.
4. Network Optimizations are enabled. This option is disabled by default. It is only suggested to enable Network Optimizations if you are having issues streaming, which you kind of are as your log contains streaming sessions with dropped frames. This can only be caused by a failure in your internet connection or your networking hardware.
It is not caused by OBS, but OBS can help. I would start with enabling Dynamic Bitrate. The setting can be toggled in Settings -> Advanced -> Network. If still having issues, follow the troubleshooting steps at:
Dropped Frames and General Connection Issues.
If still having issues, post a new log.