Game freezes momentarily after everyone reaches 100% and at spawn

League freezes every game in all modes right after everyone reaches 100%. After about 1 minute the game appears at the spawn and freezes for another 10-20 seconds, then all of the sudden everything catches up and the rest of the game is normal with no lag. This started happening directly after the latest patch. After contacting league support I was told that my logs also indicated a crash.

I have done the following:

• reinstalled graphics drivers both render and display (Nvidia 960M and Intel HD 4600 respectively) with clean install
• rolled back drivers to old version
• reset graphics settings
• a full repair of league
• ran dism tool and sfc scan
• ran hextech repair tool, both repatch and reinstall
• completely uninstalled and reinstalled league
• tried with lowest graphic settings
• tried low spec mode
• tried without character inking
• tried with both capped at 30, 60, and uncapped framerates
• tried with borderless, windowed, and fullscreen mode
• tried with power settings all to highest performance
• tried with nvidia card set as the global preferred video card
• ran with the nvidia card through the context menu
• ran with nvidia power and other settings all towards highest performance
• both disabled and uninstalled antivirus
• ran with no programs running
• done a clean, diagnostic, and basic boot
• checked which card my other games run under (Nvidia)
• tested performance with other games (they all run normally)

In the logs my game stops directly after these lines: > 000054.233| ERROR| Can not open file <SummonerObserver.dds> ********* > 000054.233| ERROR| Failed to load SummonerObserver.dds > 000054.234| WARN| r3dTexture EX: SummonerObserver.dds - not found. Dummy text

Then resumes from the texture error (I believe the texture error is unrelated): > 000054.233| ERROR| Can not open file <SummonerObserver.dds> ********* > 000054.233| ERROR| Failed to load SummonerObserver.dds > 000054.234| WARN| r3dTexture EX: SummonerObserver.dds - not found. Dummy texture created. > 000054.324| ALWAYS| FLOW| SEJ-74A6B1FA. > 000054.398| ALWAYS| Spawning heroes/minions > 000054.398| ALWAYS| CFG| MultiplayerSettings EnableLNP=true Encryption=true Compression=true Logging=false Wireless=false Redundancy=false Threshold=0 Capacity=1000 Resends=20 > 000054.400| ALWAYS| Finished spawning heroes/minions > 000162.187| ALWAYS| ALE-MM44G8Q7 (120.2982182 8.347506 0.051754 0.000009) > 000241.293| ALWAYS| ALE-P6S77E01: (0)(0.043)(0.000)(238.141)(246.333)(8.346)(0) > 000241.375| ALWAYS| FLOW| Switching Game State from GAMESTATE_SPAWN to GAMESTATE_GAMELOOP for reason Received Game Start Packet. > 000242.133| ERROR| >>> BuffHashMap::HashToName - Match not found for hash 0f7c3eb1 > 000291.534| ALWAYS| GAMESTATE_GAMELOOP Begin > 000291.577| ALWAYS| GAMESTATE_GAMELOOP Update World > 000297.534| ALWAYS| r3dRenderLayer::RecreateOwnedResources > 000299.105| ALWAYS| r3dRenderLayer::RecreateOwnedResources > 000300.862| ALWAYS| GAMESTATE_GAMELOOP GUIMenuProcess

I'm running the following hardware: > Operating System: Windows 10 Home 64-bit (10.0, Build 17134) (17134.rs4_release.180410-1804) > Language: English (Regional Setting: English) > System Manufacturer: ASUSTeK COMPUTER INC. > System Model: G551JW > BIOS: G551JW.209 (type: UEFI) > Processor: Intel(R) Core(TM) i7-4720HQ CPU @ 2.60GHz (8 CPUs), ~2.6GHz > Memory: 16384MB RAM > Available OS Memory: 16274MB RAM > Page File: 5721MB used, 11575MB available > Windows Dir: C:\WINDOWS > DirectX Version: DirectX 12 > DX Setup Parameters: Not found > User DPI Setting: 120 DPI (125 percent) > System DPI Setting: 120 DPI (125 percent) > DWM DPI Scaling: UnKnown > Miracast: Available, with HDCP > Microsoft Graphics Hybrid: Supported > Card name: Intel(R) HD Graphics 4600 > Card name: NVIDIA GeForce GTX 960M (Render only) >Core isolation: on

More information can be found on my support ticket number 36146336 if someone from riot happens to see this.