Here are the log lines that appear when I put too much texts. I have tried changing the font, switching to a new scene with nothing in it. It doesn't solve the problems.
22:02:20.493: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:20.497: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:24.646: DirectWrite: CreateFontFaceFromHDC() failed (Indicates an error in an input file such as a font file.) for QFontDef(Family="8514oem", pointsize=9, pixelsize=20, styleHint=5, weight=400, stretch=100, hintingPreference=0) LOGFONT("8514oem", lfWidth=0, lfHeight=-20) dpi=96
22:02:28.218: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:28.220: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:35.335: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:50.468: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:02:52.601: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:04:03.822: device_texture_create (D3D11): Failed to create 2D texture (80070057)
22:04:03.825: device_texture_create (D3D11): Failed to create 2D texture (80070057)