Hello,

Following customer reports, we investigated, the cause are prestashop servers since some resources needed to load the back office are unavailable more or less long and recurrent, therefore cause more or less severe problems

Sources involved :

http://profile.prestashop.com and http://gamification.prestashop.com/css/advices/advice-1.6.1.21_479.css

Solutions :

1. Disable module gamification

https://www.webbax.ch/2014/05/14/prestashop-tres-lent-brusquement/ 

2. Prevent check update modules by Administration/Preferences

3. Complain to Prestashop on their forum or technical helpdesk