Leen15 on "More then 3-4 plugins give me error 500"

Hello,
my blog is on the way of the dead.

Everyday, one or more plugins update itself, and every time i have my blog down with a white page (error 500).

Until about 1 month ago all was fine, but now i cannot understand what is the problem, no error in apache log, i have some PHP notice in debug.log but these messages don't give me a blank page on frontend right?

For now, i have to disable these plugins:
Add Linked Images To Gallery
Automatic Youtube Video Posts
Import External Images
Video Thumbnails

Someone can help me? Is the new wordpress version that cause all this problems?

Thanks a lot.