This happens very rarely, but if there is one time it will be forever, until I restart my PC. What is the problem? I have a powerful PC, and the game recently reinstalled. Before reinstalling the game also crashes. This happens very rarely (2 times per week), but very annoying...

osu! version: 20160821.1 (latest)

There's not much anyone can do to try and help without a crash log. If you get a window titled 'oh no' then click the image and copy paste the crash log it gives you. If it's a 'has stopped working' window that pops up check the event viewer under windows logs -> application. Screenshots are often helpful.

There is error and screenshot:

Error:
Приложение: osu!.exe Версия платформы: v4.0.30319 Описание. Процесс был завершен из-за необработанного исключения. Сведения об исключении: System.AccessViolationException в OpenTK.Graphics.ES20.GL.BufferSubData[[osu.Graphics.OpenGl.TexturedVertex2d, osu!, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]](OpenTK.Graphics.ES20.BufferTarget, IntPtr, IntPtr, osu.Graphics.OpenGl.TexturedVertex2d ByRef) в #=qkyGB_tC90yIBc9PKyyH5h110FUCowOvOgIyDCH4MB5vgPz4BNSzibJDypJBhxBhF[[osu.Graphics.OpenGl.TexturedVertex2d, osu!, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]].#=qYCcP6WJf2Ub45PawgQftnw==(Int32, Int32) в #=qSdetigc1ICksGdS4rPRNf8PbSvYmp7bC6vv8n2N9EkyFjH6U9byNnKK3U$jGZMzs[[osu.Graphics.OpenGl.TexturedVertex2d, osu!, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]].#=qiTRDoOfMmrkp6NnYgQP6lw==() в #=qcMPBLt$O81VVskQ6Rnn7u1G$Zb8vaZnSuDyKo0IvqJTsTa5hqbBIy7v4PIN8R4Xw.#=quihrAkOQub41zjfIZuNixA==(Int32) в #=qzdjp8CrNsi3IWQKLMX6Nz$90vEXATJ7wiWr_eh32wgboqxJbbC8bnZbWqF1JESTq.#=qErTmF2R_j1pcdmvVsgl$mQ==() в #=qzdjp8CrNsi3IWQKLMX6Nz$90vEXATJ7wiWr_eh32wgboqxJbbC8bnZbWqF1JESTq.#=qiTRDoOfMmrkp6NnYgQP6lw==(Microsoft.Xna.Framework.Vector2, Microsoft.Xna.Framework.Vector2, Microsoft.Xna.Framework.Graphics.Color, Microsoft.Xna.Framework.Vector2, Single, System.Nullable`1<Microsoft.Xna.Framework.Rectangle>, #=qSdetigc1ICksGdS4rPRNf8PbSvYmp7bC6vv8n2N9EkyFjH6U9byNnKK3U$jGZMzs<osu.Graphics.OpenGl.TexturedVertex2d>) в #=qOg$8OpX6rjjqfKf0HydSwao6rHRS9GIU80WiVyi9Geo=.#=qiTRDoOfMmrkp6NnYgQP6lw==() в #=qabMkS2BFUw$Fxve_$jiLWoolNAD3EcG1enqUeufcf2$GeacLoItyzzOw8g_Q6uAC.#=qiTRDoOfMmrkp6NnYgQP6lw==() в #=qhcdsmHKxZwPTRZPNxxI9xg==.#=qiTRDoOfMmrkp6NnYgQP6lw==() в #=qAkHJBm5fi9ln9$$bZIjescOkA1tsEGlxBb$eY8a3kLI=.#=qfSAa5UefHlzCMT7rH0nbvw==(System.Object, System.EventArgs) в #=q1RSgWZMfgujbYjeVUX5et9AsKoCpk7x1Mjadoavchhw=.#=qADXXYsUpIC7ID5r7ipH7Cg==(System.Object, System.EventArgs) в #=qK_aaJviHDjaYAxdD4NydEM0BymkooXr8XwavfFj1e6Y=.#=qXFopDMoIFn51vwUc$Jk9k0ygFGhb5k8mXkspfBQCE7M=(System.Object, System.EventArgs) в System.Windows.Forms.Application+ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32) в System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32) в System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext) в System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext) в System.Windows.Forms.Application.Run(System.Windows.Forms.Form) в #=qK_aaJviHDjaYAxdD4NydEM0BymkooXr8XwavfFj1e6Y=.#=q2duPe9AdIZmY9_cLc5rY2g==() в #=qAkHJBm5fi9ln9$$bZIjescOkA1tsEGlxBb$eY8a3kLI=.#=q2duPe9AdIZmY9_cLc5rY2g==() в #=qK4YQYM5v9NKeM_T4AGhSfQ==.#=qGoVlp_yh1VIHKE3z0_6Y5w==(System.String, Boolean, Boolean) в #=qK4YQYM5v9NKeM_T4AGhSfQ==.#=qn8pqMBt6SN944L8I_VhSoQ==(System.String[]) в #=qK4YQYM5v9NKeM_T4AGhSfQ==.#=qFxGP19JipXm1niSdfC6ppQ==() в #=qN_rYieVj$wL9WSIM4ELK0MuQomx1FYCDBljYyiEZFpM=.#=qny8FGG1hb4I89vxYOenQrg==()

Screenshot here: http://hostingkartinok.com/show-image.p ... 35bfd66b51