For some reason, go4 resets the values of my maximum altitude (and RTH maximum altitude, and multiple flight modes, and enable obstacle avoidance) to 40m. I can't go higher than that. And that is REALLY annoying.
I installed the GO4 on another phone, iPhone 7, to eliminate the possibility that it was a device issue (I use the ipad mini 2 and though it might have gotten to old to deal with the new updates), same problem persisted. So I uninstalled and reinstalled GO4, and created a new account, to eliminate the possibility that the problems are due to my Spark, and, surprisingly, the problems PERSISTED. I don't know what to think now...
Anyone had encountered this problem before? Anyone with a solution?
DJI costumer service is VERY slow to respond.
HELP?
P.S
Just upgraded to ios 11.  And getting weak image transmission signal. Which really sucks. But I see that this problem is common to many with OTG cable and the new update (or shall i say "downdate"). DJI, get a grip on yourselves. Thats not the way to keep your costumers happy.

Hi, sir. Please try to update your IOS system to the latest one. What is the version of your app? Please tell me the firmware of your drone. The latest IOS system is 11.2.1. If the problem remains, please inform us.