Amember SQL member error

Hi all
Im using amember for almost 3 months and no problem but one of my member cant access his account.
I add him manualy on amember and i test his account from my computer and works.....but when he try to login he get an error and he try from almost 3 computer from diferently place and the same thing.
The error looks like this.

MYSQL ERROR:
MySQL server has gone away
in query:
INSERT INTO amember_access_log (member_id, remote_addr, url, referrer) VALUES (271, '100.100.100.100', '/amember/login.php?amember_login=user&amember_pass=123456&submit=Login+%C2%BB&amember_redirect_url=%2F', 'http://mywebsite.com/')

I change his IP adress and user on this code.

Now another error what he get.

MYSQL ERROR:
MySQL server has gone away
in query:
INSERT INTO amember_error_log (member_id, time, remote_addr, url, referrer, error) VALUES (NULL, NOW(), '100.100.100.100', '/amember/login.php?amember_login=user&amember_pass=123456&submit=Login+%C2%BB&amember_redirect_url=%2F', 'http://mywebsite.com/', 'MYSQL ERROR:
MySQL server has gone away
in query:
INSERT INTO amember_access_log\r\n (member_id, remote_addr, url, referrer)\r\n VALUES\r\n (271, \'100.100.100.100\', \'/amember/login.php?amember_login=user&amember_pass=123456&submit=Login+%C2%BB&amember_redirect_url=%2F\', \'http://mywebsite.com/\')\r\n ')

So whats goin on because i have no idea
Regards