MEGA 1280 watchdog

I have a solution that I program without the bootloader (using the ISP AVR MKII). I was having issues with a unstable network so I implemented a watchdog timer to reset the device if needed. The problem is that when it resets, it just stays reset, it does not reboots until I cycle the power. Can anyone point me in the right directions, as I stated, not bootleader programmed using [shift] program...