I had almost the same case in April.
I don't know how much it was connected to the FW update, but it actually happened 2 flights after upgrading to 1.8.
My story made it even worse, i don't know if this will make you feel better - I am not in US and i had to send drone to Germany, which cost me around 80$. They replaced it, saying it was faulty and sent me new p3a. For receiving which i had to pay piggy government around another 80$ for tax fee. So 160$ and 3 months of no flying.
+ Received new one. After couple of weeks remote controller started having issues. Now i have to send it to them(thank god this time DJI is paying for shipping, cause i flipped out at them) and meanwhile i am using my friends extra RC.
My opionion regarding updates.
I think you should not do an update if everything is working fine. 1.5 and 1.6 had some fixes, which were crucial. But since then i doubt something more crucial is changing. All i hear is ESC errors and etc.
Now i am on 1.9FW. Working fine. i doubt i will be updating to the next one after that. Because every new update - decreases of amount of flyers.