I dont think this is connected to 1.9.
Here is my story. I updated to 1.8, when the update failed. Then phantom was beeping like crazy everytime i turned it on.
After that i learned that i had to wait through it. after 15 minutes of shagging my ears, the beeping stopped, and updated the FW succesfully.
A week later, i got an ESC status error. Even though i have never crashed.
I sent it back to DJI. They replaced it. Sent me the new one.
I installed 1.9 firmware. right away. after 2 days, i inserted a different sd card in there, which i forgot to check, had 1.8 on it. The drone started update and i turned it off in the middle. GOt scared.Turned it back on, that crazy beeping on my brand new drone.
Waited through, installed 1.9. Flying since then without a problem. I hope no more ESC status error for me.