I really never solved the problems on my Toshiba laptop despite new fan and motherboard. I started getting fatal machine checks after a long series of corrected machine checks and discovered these were hardware related, not Vista. Toshiba, however, ran out the clock on my warranty. The head engineer at their hq said he couldn't get the AMD program to read the event errors to work, despite it being installed on the computer and a zipped copy in a file on the desktop along with the readme on how to use it! So I bought a HP HDX18 at their site when their monthly 30% off coupon came out and I've never had a wake from sleep problem or many event errors! Subsequently, when I do turn on the Toshiba I see temperatures rising quickly to the 80 degree range, so I don't use it. A friend in another city reports huge problems with a different Toshiba model and resorting to buying another cheap laptop of a different brand.
I did fix the network being dropped and then resuming all by itself a little later by going to the Intel site and reading how to set the Advanced tab's various settings under Properties and that AES not TCKP should be used for WPA Personal and WPA2 Personal under security settings for my router, despite what Linksys said (I may not have the names for these setting exactly right, doing this from memory).
Intel® WiFi Products - How to access and configure advanced Wi-Fi adapter settings on Windows Vista*
I am sorry if this isn't helpful, I spent a painful year trying to get that laptop to work. Have you downloaded SP2? I was told by level two Microsoft technicians trying to help me on my various cases that SP2 was rumored to help with sleep/wake problems.
I also discovered the an undate to Defender was downloaded during the night, when my computer was asleep, even though I had Windows Update set to Never Check for Updates, as a Platinum Level HP technician in Canada recommended. I was, and am, furious about that! After talking to a roundd robin of people at Microsoft about this, someone called me back the next day from Vista and said to disable it in Services and then just reenable it to go to Windows Update and then disable it again, which I have done. Windows Update, and TV programs if you have a TV tuner, will wake the computer. In fact the defragger may be set to operate at night and that will wake the computer. You have to go through everything in Task Scheduler.