Another /wp-admin white page issue

I had wordpress installed on my hosted server (ixwebhosting) for a while, however I haven’t touched my site in a long time. I went to log into wp-admin back on version 2.6 and it showed a white page. I proceeded to install 2.7 and everything installed and worked fine. However after about 10-15 minutes after I log off the wp-admin page seems to go offline.

I disabled all plugins. Everytime I reinstall everything works fine.

The only modification I are simple edits to the wordpress classic template.

http://www.pixelharmony.net

Any input would be appreciated.