Suspended accounts automatically

[h2dobe]

Hello,

since one week, two of eight domains in my Plesk Panel are automatically switched to suspended domain.
Every day, I have to reactived these domains to make it pointing on respective website (pointing on a default page of Plesk when suspended).
After reactivation, it still get an red interrogation point right next to these domains however no one quota (disk, traffic,...) is exceeded.
I already try some options like Validity period (set to unlimited),... but in vain.

Here is some technical informations about the system:

Hoster: OVH (Kimsufi 2go)
Operating system: Ubuntu 10.04 LTS 64bits
Plesk Version: 10.4.4

Does anyone knows this problem ? Is there a solution to avoid that ? Do you have some good advices for a rookie ?

Thank you in advance for helping me

PS: sorry for my poor English...