Site blank, need frequent Apache restart

Hi,

Please help an emergency here. My website, hosted with zen-cart v1.30, has been running fine until couple days ago. The mainpage just showed blank - white blank, no error message or anything. I have absolutely done nothing special except uploading some new products recently.

I contacted the server admin, and they suggested me to restart my Apache. I did, and the site was back ok. BUT, a while later it was all blank again!

I now have to constantly monitor my website, and if it turned blank, restarting the Apache (httpd). I have been thinking using a cron job to do so, but ultimately there is something wrong I need to fix.

Please help... any idea why it is doing so?

Thanks,
Guang

Did the server admin advise of any changes they might have made to the server itself?? Updates, Upgrades, etc... ?? Is this a shared server host? Unlikely that it is Zen Cart that's causing the issue.