In my (somewhat newbie) opinion, you've probably fudged up your power connector.  Follow these detailed instructions here...
https://bitcointalk.org/index.php?topic=205369.0
And try making a new connector.

I honestly don't know what would make a Blade restart though except maybe heat.  But I live in Phoenix and its literally 110F during the day so it gets hot in the house even with the air on and I've managed to keep 6 Blades running but nothing but 140mm PC fans blowing directly on the heat sinks.

You may also want to check your network connection.  Don't do WiFi if you can help it.