What about those zipped dmp files?
Your processor temperature seems to be at 44C. If this is while your computer is idle, it seems little bit too high. Your processor max temp is listed at 72C.
Does the shutdown happen when you're doing something in particular?
Cleaning the computer is not a big thing to do.
Buy a can of compressed air.
Turn computer off.
Remove side panel.
Using compressed air, blow all dust, and garbage out. When spraying fans, hold the blades with a pencil, so the blades won't get damaged from spinning.
With side panel off, turn computer on, and see, if all fans are running.
If so, turn computer off, put the side panel back, and you're done.