My iMac 5k Retina freezes and reboots unexpectedly

My iMac 5k Retina freezes and reboots unexpectedly...
System log does not show any errors before the reboot entry...
Hardware test was OK. Disk has no problems.
Any ideas?

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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