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我在wordpress（self hosted）上遇到以下問題。圖象I上傳失敗，無論是由不運算（和提HTTP錯誤），或者通過顯示以下錯誤的80％：頻繁上傳失敗，損壞的文件
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png: fatal libpng error: IDAT: CRC error in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png error: setjmp returns error condition in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in 'PNG' format in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn't create GD Image Stream out of Data in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png: fatal libpng error: IDAT: CRC error in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png error: setjmp returns error condition in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in 'PNG' format in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn't create GD Image Stream out of Data in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png: fatal libpng error: IDAT: CRC error in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: gd-png error: setjmp returns error condition in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in 'PNG' format in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn't create GD Image Stream out of Data in /home/content/60/4915360/html/wordpress/wp-includes/media.php on line 258
最重要的是，如果該圖像是一點點太大（〜400k是好的，不是900k），它會上傳，但有80％的機會被破壞（即大塊的倒置/交換/位移顏色）。這可能與wordpress無關，因爲我也在其他服務上觀察到這種腐敗現象（deviantart，shownd）。我以前認爲這是因爲這些服務質量差，但我開始懷疑我的connexion（我正在使用我的大學的網絡）的問題。
你知道什麼會導致這些問題嗎？