In serverlog i see many errors like:
[Mon Apr 22 04:57:17.254256 2013] [core:notice] [pid 19625] AH00052: child pid 24278 exit signal Segmentation fault (11)
this probably causes a magento website not to work, other websites are running fine.
Someone installed apc and memcache for magento, and i think it probably has to do with that.
Please only bid if you are sure you can fix this. This because dissapoinment with other server admin on freelancer.
If it runs one week without errors, payment will be made.