I believe the last firmware update was in late July or August. It advertised some new modes like tripod mode etc. However, it also imposed new flight restrictions AND no longer allowed downgrading to previous versions. This update seemed to cause problems for some. One problem was the instructions were not clear since it was important to update the RC first, then the AC.
In my case, the latest version did change some of my flight characteristics but worse, restricted where I could fly. I chose to downgrade to the previous version, the one it had when I bought it. After getting a bunch of annoying messages to upgrade I downgraded the app. Now, it flies like it first did and the messages are at a minimum.
I think you need to be at the latest versions of AC, RC and app to work correctly. Some have found later versions of apps are taxing their devices as well. Or, downgrade to older versions which is tricky, but doable.
Geo