Electrcial goes out randomly

I have a 2006 Dodge Ram 1500 5.7L and every now and then I put my keys in the ignition and the electrical goes out and the truck won't start. I disconnect positive battery cable and wait about 30 seconds and then reconnect and it starts but when it does it starts kind of slow at first like when you leave the head lights on. Today the same thing happened and I went through the normal process but this time nothing happened. Any ideas???

Check the battery ground wire to where it's attached to the battery and the engine and be sure it's still tight.

That worked! It felt tight though. Any other reason the ground could be.doing that?

Because the computer is not seeing a true 12volts.

Got it. Thanks for the help.