Mac Mini Server freezes hard, too hot?

Hi,
Our Mac Mini Server (half a year old) with the newest system crashes hard now and then.
It could run for up to three weeks occasionally but now in the summer it could sometimes only run for minutes until it hangs hard with frozen mouse and clock.
I have found no other way than resetting by the power switch.
According to the technical specification it should handle up to 35°C environment. (Right now we have 28°C in the room here.)
It seemed to help a bit by installing smcFanControl and increase the fan speed.
It will crash even without any work being done on it. No special applications started. No network traffic.
If the exhaust temp is above about 32 to 34° the problems seem to worsening. Now it is 37°C despite full fan speed (5500 rpm) and it crashed after minutes.
Sometimes it will even hang during the boot process.
Have anybody else heard about such problems?

Hi MalcomKay,
I had to open a service ticket as Jiri suggested. The technician was pretty sure the crashes were caused by a defective Airport board and exchanged that (despite I doubted that and never used Airport for the server).
I came back home (2x2x120 km of travel) and started the Mac Mini Server up. I booted and run the AppleServerDiagnostics.app test from an USB. It lasted 15 minutes (until it was warmed up) and then crashed so hard it was not counted by the test. It just froze hard. It crashed when running the memory test. It always crashed before finish when running that test!
I returned the server to the Apple Service (another 480 km of travel). This time they exchanged the whole motherboard. They tested it running intense traffic and operations for one full week without a freeze. So it was a faulty mother board!
Now it has been running like a charm for months.
This is not the first temperature problem affected board Apple has delivered to me.
Good luck! /Johan
Tips: Prepare an USB stick you can boot from. It is so frustrating to have a computer without a dedicated DVD where you can boot from and run the hardware tests.

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Message was edited by: Andrew Checkley

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1. Go to System Preferences.
2. Select Engery Saver
3. Slide the setting for Computer sleep to never.
4. Slide the setting for Display sleep to never (though I believe the display should be able to sleep without much issue.
5. Make sure the following are not selected:
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b. Allow power button to put the computer to sleep.
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a. Wake for network access
b. Start up automatically after a power failure
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G-technologie 8 TB G-SPEED Q RAID-oplossing (hdtower)
UPC of EAN nr.: 705487185744 in the mac store
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My new Mac Mini Server 2011, with lion, sleeps every day! Server not responding.
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Please, I need help with this problem!
How to fix it?

1. Go to System Preferences.
2. Select Engery Saver
3. Slide the setting for Computer sleep to never.
4. Slide the setting for Display sleep to never (though I believe the display should be able to sleep without much issue.
5. Make sure the following are not selected:
a. Put the hard disk(s) to sleep when possible.
b. Allow power button to put the computer to sleep.
6. Make sure the following are selected:
a. Wake for network access
b. Start up automatically after a power failure
c. Restart automatically if the computer freezes.
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Hi,
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