Something is up with your network. Ditch the multi out until you figure it out.
12:20:10.408: WriteN, RTMP send error 10060 (4097 bytes)
12:20:10.408: WriteN, RTMP send error 10038 (59 bytes)
12:20:10.408: WriteN, RTMP send error 10038 (42 bytes)
12:20:10.408: [rtmp stream: 'multi-output'] Disconnected from rtmp://x.rtmp.youtube.com/live2
12:20:10.408: Output 'multi-output': stopping
12:20:10.408: Output 'multi-output': Total frames output: 16772 (17195 attempted)
12:20:10.408: Output 'multi-output': Total drawn frames: 17245
12:20:10.408: Output 'multi-output': Number of dropped frames due to insufficient bandwidth/connection stalls: 423 (2.5%)
12:20:10.408: Output 'multi-output': Reconnecting in 2.00 seconds..
12:20:10.408: [rtmp stream: 'multi-output'] Freeing 730 remaining packets
12:20:10.414: WriteN, RTMP send error 10060 (4097 bytes)
12:20:10.414: WriteN, RTMP send error 10038 (80 bytes)
12:20:10.414: WriteN, RTMP send error 10038 (42 bytes)
12:20:10.414: [rtmp stream: 'adv_stream'] Disconnected from rtmp://live.twitch.tv/app/
12:20:10.414: Output 'adv_stream': stopping
12:20:10.414: Output 'adv_stream': Total frames output: 16511 (16946 attempted)
12:20:10.414: Output 'adv_stream': Total drawn frames: 17246
12:20:10.414: Output 'adv_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 435 (2.6%)
OBS Knowledge Base. Dropped frames? Your stream is disconnecting? This guide will help you troubleshoot common connection issues.
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HAGS & Game DVR should be disabled & a couple of Scenes need attention as they have multiple Display, Game or Windows captures.