LJ problems

My LJ has become unstable.
It started yesterday - the page keeps flashing & I can't get comments to open so that I can reply to them.
I wondered if it was a problem with my customised theme & so I've changed it to one of the free ones. Unfortunately, this doesn't seem to have helped.
I've now discovered that by removing any youtube embeds, the problem is solved.
*sigh*
Not a great solution, as I love my youtube vids but at least my LJ is working now.

Is anyone else having this kind of problem - or knows of a better fix please?