Jon_King - 2:54 pm on Sep 27, 2011 (gmt 0)
I've had the same problems. Last week I had a site shut down by a popular host and the reason they gave was a gallery plugin was hacked with an SQL injection that mucked up the shared server I am on.
I started password protecting the major folders and it seems to have helped.
The updates do cause me issues also. With 15 or so plugins several usually require special attention. In addition, file permissions almost always need changing to install and then resetting them to back original state is a hassle.