Internal Server Errors caused by domain mapping recent update?

hey there,
I've been having many Internal Server Errors on my multisite since yesterday. I've contacted my server company and they've said, that most likely, domain-mapping plugin causes the issue. It seems that I run out of PHP processes, because domain-mapping plugin is constantly 'activating' admin-ajax.php script.

I've updated domain-mapping to the latest 4.3.0.4 yesterday, but just downgraded now.
What can I do to avoid this issue? My server environment is set up to the limits when it comes to php use, so perhaps I can set limits in wp-config or somewhere like that? That's what server company suggests, but I'm not sure what and how to do that.

I'd appreciate your help!

thanks,
Adam

admin 14677 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14755 9.0 3.2 185432 101676 ? R 04:16 0:01 /usr/local/php5/bin/php-cgi-real /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14767 0.0 0.0 17508 1400 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14769 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14770 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14772 0.0 0.0 17508 1400 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14774 0.0 0.0 17508 1400 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14775 0.0 0.0 17508 1400 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14779 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14780 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14781 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14782 0.0 0.0 17508 1400 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14783 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14784 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14787 0.3 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14788 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php
admin 14799 0.0 0.0 17508 1396 ? S 04:16 0:00 /bin/bash /usr/local/php5/bin/php-cgi /home/admin/domains/bandcloud.co.uk/public_html/wp-admin/admin-ajax.php