Crash sans arrêt de Minecraft

Bonjour,

Voici mon problème, depuis peu, quand j'essaye de jouer à Minecraft, j'arrive à jouer 5 minutes puis, tout d'un coup, le jeu crash et me redirige sur le launcher, voici le message d'erreur :
[17:17:05 FATAL]: Fatal error launching game. Report this to https://bugs.mojang.com/ please!
java.io.FileNotFoundException: File 'C:\Users\<mon nom>\AppData\Roaming\.minecraft\assets\indexes\1.9.json' does not exist
at org.apache.commons.io.FileUtils.openInputStream(FileUtils.java:299) ~[launcher.jar:1.6.61]
at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1711) ~[launcher.jar:1.6.61]
at net.minecraft.launcher.Launcher.cleanupOrphanedAssets(Launcher.java:254) ~[launcher.jar:1.6.61]
at net.minecraft.launcher.Launcher.performCleanups(Launcher.java:496) ~[launcher.jar:1.6.61]
at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:231) ~[launcher.jar:1.6.61]
at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:186) [launcher.jar:1.6.61]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher.jar:1.6.61]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:1.6.61]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:1.6.61]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_91]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_91]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]
[17:17:55 ERROR]: Game ended with bad state (exit code -805306369)
[17:17:55 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[17:17:55 INFO]: Deleting C:\Users\<mon nom>\AppData\Roaming\.minecraft\versions\1.8.9\1.8.9-natives-19250604742103
[17:17:55 WARN]: Couldn't delete C:\Users\<mon nom>\AppData\Roaming\.minecraft\versions\1.8.9\1.8.9-natives-19250604742103 - scheduling for deletion upon exit


Je suis sur un Asus ROG portable avec une GTX 960M, 8 Go de RAM et sous windows 10 et je joue sans problème à BO3 etc... Tous mes drivers sont à jour et mon java est aussi à jour.

J'ai essayé sans mods, sans shaders, sans textures packs etc mais rien n'y change. Je suis en 1.8.9.

J’espère que vous saurez comment régler mon problème et merci d'avance !