Mac is crashing regularly, bringing me to a fresh login prompt

Question

I am on the latest update of Snow Leopard. It seems that if I leave the computer to go to the screensaver automatically, chances are that it may crash. I haven't changed my energy saver preferences for months - so if it is related to that it's not something I've changed.
Looking in system.log you see lots of messages at crash time of "received notification of WindowServer event port death". An extract is below.
Has anybody else experienced this?
Apple, are you investigating? This looks to me to be a serious problem. One of my colleagues is experiencing something similar. I switched to using using a mac in 2007 and immediately found it to be a better machine in every way (usability, reliability, design) than my previous windows laptop. After recent experiences I'm not convinced the reliability advantage is still there.
May 30 11:06:52 secdoor1 firefox[8777]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 firefox[8777]: port matched the WindowServer port created in BindCGSToRunLoop
May 30 11:06:52 secdoor1 Google Chrome[8629]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Evernote[8599]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Google Chrome[8629]: port matched the WindowServer port created in BindCGSToRunLoop
May 30 11:06:52 secdoor1 Evernote[8599]: port matched the WindowServer port created in BindCGSToRunLoop
May 30 11:06:52 secdoor1 Finder[8556]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Twitter[8601]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Wunderlist[8600]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 iChat[8596]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 TextEdit[8694]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Twitter[8601]: port matched the WindowServer port created in BindCGSToRunLoop
May 30 11:06:52 secdoor1 Terminal[8662]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 Preview[8851]: HIToolbox: received notification of WindowServer event port death.
May 30 11:06:52 secdoor1 SystemUIServer[8555]: kCGErrorFailure: _CGSLockWindow: Cannot synchronize window backing store
May 30 11:06:54: --- last message repeated 2 times ---

Answer 1

Thanks for the reply, Austin. I'm going to let my computer naturally lock / go to screen saver today, to see if the problem reoccurs. So far it's done so fine, twice. I'll try playing with my screen saver settings tomorrow.
Having said that, even though I am unable to reproduce the problem at will, when the problem does occur it always seems to be at a time when the computer is going to go to the screensaver / lock.
About the Apple thing, I may try their feedback page later. I would have assumed though, that they are monitoring these forums. Most companies these days do have teams of people involved in social media. If not engaging directly with customers I'd assume that they are monitoring customer feedback.