Strange problem with my site

Hi All,
I have a quite wierd problem for this site www.annoncesdumaroc.ma, here is the problem:
i hosted this site with a company, the first week it was fine, but 10 days later, i started getting a problem when tring to access the site, it says that it's dns problem. the strange thing is that i can access the site some hours late in the evening, but when the morning come i m not able to access the site. yesterday at 22h30 i accessed the site, this morning no.
i tried from different locations but i was unable. the funny thing is that some people can access my site without any problem
here is the adress again: www.annoncesdumaroc.ma
regards
please help
p.s. I can access my site through a proxy: http://202.184.252.5/webproxy/nph-pr...cesdumaroc.ma/