Error عجیب در قسمت ورود به بخش مدیریت

[pctaz]

سلام من هر از چند وقتی این ارور رو مشاهده میکنم

DB function failed with error number 2006
MySQL server has gone away SQL=UPDATE mos_session SET time='1218956798', guest=-3-guest WHERE session_id='8a744e1617de43bea7e41cddaa0f8a39' AND username = 'admin' AND userid = 62
Warning: Invalid argument supplied for foreach() in /home/xxxxxxxx/public_html/includes/core.classes.php on line 2474

و یه چیز دیگه :من هر از گاهی این ارور ها رو مشاهده میکنم (امکان داره توی هر 50 تا بازدید که از سایتم میکنم یهویی 1 مرتبه اتفاق بیافته) که با یه رفرش صفحه درست میشه و دیگه ارور نمایش داده نمیشه .

xxx 
Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/xxxx/public_html/includes/core.classes.php on line 601

Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/xxxxxxx/public_html/includes/core.classes.php on line 602

Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/xxxxx/public_html/includes/core.classes.php on line 603

Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/xxxxxx/public_html/includes/core.classes.php on line 604

Warning: Cannot modify header information - headers already sent by (output started at /home/fanavari/public_html/includes/database.php:248) in /home/xxxxxx/public_html/includes/core.classes.php on line 605


Warning: Invalid argument supplied for foreach() in /home/xxxxx/public_html/includes/cmtclasses.php on line 664

Warning: Invalid argument supplied for foreach() in /home/xxxxxx/public_html/includes/cmtclasses.php on line 664
'IT - GROUP'  می باشید.

Warning: Invalid argument supplied for foreach() in /home/xxxxxxx/public_html/includes/cmtclasses.php on line 664
شما مجاز به دیدن این منبع نیستید.
شما باید وارد شوید 
Warning: Invalid argument supplied for foreach() in /home/xxxxx/public_html/includes/cmtclasses.php on line 664

Warning: Invalid argument supplied for foreach() in /home/xxxxxx/public_html/includes/cmtclasses.php on line 664



Warning: Invalid argument supplied for foreach() in /home/xxxxxxxx/public_html/includes/cmtclasses.php on line 664

Warning: Invalid argument supplied for foreach() in /home/xxxxxxx/public_html/includes/cmtclasses.php on line 664

Warning: Invalid argument supplied for foreach() in /home/xxxxxxx/public_html/includes/cmtclasses.php on line 664