I didn't forget my passcode but all of a sudden I got the iPhone unavailable try again in 7 min. what is going on????

Normally that happens when a passcode is entered wrong too many times. The iPhone will be unavailable for a specific amount of time. Enter a wrong passcode again, and the time will increase.

It can happen, that the iPhone wakes up in a pocket or purse and something presses against the screen causing the entry of a wrong passcode. If this happens enough times the iPhone becomes unavailable.

Make sure when putting the iPhone in your pocket or purse, the screen is turned off, and there's nothing nearby that can tap the screen.