WordPress is deleting iFrame and Script code from my Pages

This is so frustrating that I’m at the point of getting rid of WordPress forever. I cannot figure out why WordPress keeps deleting my iframe and Script tags. I have heard people complain that if you switch back and forth between the visual and text editor it can do this, but this is not the same problem I have. The problem is, it works great for days, then just all of sudden WordPress starts deleting code on my pages without even being in the editor at. This is just pain stupid and I wished I could figure out why the WordPress developers would allow this. Does anyone have a work around for this? I have tried [Raw][/Raw]shortcuts and everything, but after a few days my tags still seem to disappear. Boy this is just frustrating. I hope I can find a solution soon.

Tnx.