Linux vps problems

Hi. We have a big problem with our linux vps. It's going down like 3 times a day. We build wordpress websites in Mexico and have around 80 accounts hosted in a hostgator linux vps. The following are the statistics of the use of CPU provided by hostgator today.

Top PHP Users
5 maycky -> CPU %: 0 | Mem %: 4.4
4 masfe -> CPU %: 0 | Mem %: 5.7
4 beenetmx -> CPU %: 0 | Mem %: 3.5
3 526 -> CPU %: 0 | Mem %: 2.6
2 monjaras -> CPU %: 0 | Mem %: 2.5
2 mencare -> CPU %: 0 | Mem %: 1.6
2 afinacar -> CPU %: 0 | Mem %: 2.2
2 575 -> CPU %: 0 | Mem %: 1.4
2 574 -> CPU %: 0 | Mem %: 2.5
2 546 -> CPU %: 0 | Mem %: 1.6
2 542 -> CPU %: 0 | Mem %: 1.6
2 536 -> CPU %: 0 | Mem %: 2.2
1 saludpsi -> CPU %: 0 | Mem %: 0.7
1 drairene -> CPU %: 0 | Mem %: 0.7


Top PHP Scripts
5 /home/maycky/public_html/index.php -> CPU %: 0 | Mem %: 4.4
3 /home/beenetmx/public_html/index.php -> CPU %: 0 | Mem %: 2.7
2 /home/sofiagonzalez/public_html/index.php -> CPU %: 0 | Mem %: 1.6
2 /home/orangemedical/public_html/wp-login.php -> CPU %: 0 | Mem %: 1.4
2 /home/notaria71/public_html/wp-login.php -> CPU %: 0 | Mem %: 2.5
2 /home/monjaras/public_html/wp-login.php -> CPU %: 0 | Mem %: 2.5
2 /home/masfe/public_html/wp-admin/admin-ajax.php -> CPU %: 0 | Mem %: 2.4
2 /home/drjorgeobregon/public_html/index.php -> CPU %: 0 | Mem %: 1.6
2 /home/dragonzalezjaure/public_html/wp-login.php -> CPU %: 0 | Mem %: 1.5
2 /home/caegrupomedico/public_html/wp-login.php -> CPU %: 0 | Mem %: 2.2
2 /home/afinacar/public_html/index.php -> CPU %: 0 | Mem %: 2.2
1 /home/saludpsi/public_html/wp-login.php -> CPU %: 0 | Mem %: 0.7
1 /home/mencare/public_html/wp-login.php -> CPU %: 0 | Mem %: 0.8
1 /home/mencare/public_html/index.php -> CPU %: 0 | Mem %: 0.8
1 /home/masfe/public_html/wp-admin/plugins.php -> CPU %: 0 | Mem %: 1.7
1 /home/masfe/public_html/index.php -> CPU %: 0 | Mem %: 1.6
1 /home/drairene/public_html/wp-login.php -> CPU %: 0 | Mem %: 0.7
1 /home/dragonzalezjaure/public_html/index.php -> CPU %: 0 | Mem %: 1.1
1 /home/beenetmx/public_html/wp-login.php -> CPU %: 0 | Mem %: 0.8