Dji 4 beeping error at start up

[skyhawkdronesolutions]

I went on a hike yesterday and tok my phantom 4 out with me. took it out of my case and did my checklist as always and flew for about 10 minutes. Nothing special, no hard flying , no hard landing. Packed it back up( left battery connected). About 15 min later I take it back out to film another area, and the drone is giving me this crazy beep. "B.......B.......B.......B" all while the motors twitch. The controller shows that i am connected to the drone since i have full control over the gimble ( i'm able to move it up and down , i have visual connection, i can record and take pics.) The weird part about this is that i have no connection to the aircraft it seems. Bo battery temp, no voltage sensors etc. Any help is welcome thanks all....