The controller is buzzing with electromagnetic activity.
DJI have no control over where the compass sensor is in your phone which is the cause of your issue.
As issues go, it's not a big one.
Because DJI's help people know about as much about the issue as you do and they'll say anything to get rid of you.
Don't take them seriously
And ... it's not a compatibility issue.
hmmm to answer your comment "Because DJI's help people know about as much about the issue as you do" You are right that the DJI help people have limited knowledge of the problem which is obvious in the correspondence I have had with them however I have worked for over 25 years in the cellular communication industry (USA and UK) designing and writing software so I am fully aware of how a mobile phone works and a lot of thought goes into the location of the compass sensor but that is not the issue here, the issue is DJI say they have tested a list of phones with their Mavic Mini RC stating they are COMPATIBLE which I repeat MEANS "two things are able to exist or occur together without problems or conflict" - THAT IS WHAT COMPATIBLE MEANS. DJI instruct people to buy these COMPATIBLE phones for use with the RC from a list they provide which are an expensive outlay when you consider the Mavic Mini is a low entry drone, so after purchasing a phone and finding it is not COMPATIBLE shows DJI did not test these phones properly and the fact that the controller is buzzing with electromagnetic activity is irrelevant. Although, interestingly, the other Mavic RC's do not seem to experience the same problem yet! Because it will be very interesting to see what happens when the other apps migrate to 64bit CPU forcing people to buy a new phone!!
Reports are also saying that things got worse since the firmware update 1.0.3 (Optimized Aircraft Orientation), so I assume DJI tried to compensate with an offset which has now made it worse for a lot of people. What was "sort of working" does not work at all since the update?
It is true to say some of the phones on their list ARE compatible but there is a lot that are not including some recent IOS phones, and as for your comment about the issue "not being a big one" is your opinion and not of the majority and especially people who like to fly safely - clearly you don't mind paying for something that is not fully functional. And let's not forget Aircraft Orientation is a safety feature: A: To check orientation B: To efficiently direct the WIFI signal towards the aircraft even when in line of sight.
Opening the map view to check aircraft orientation should be considered as a fallback/failsafe option, the feature on the main screen needs to be working especially for people who have never flown before which someone has already mentioned here in the forum and they are 100% right.
These phones in most cases are over double the cost of the Mavic Mini Fly More Combo and people are not made fully aware of this additional expense, so to be told by DJI which phones to buy that turn out to be INCOMPATIBLE is disgraceful especially when they tell you to buy yet another one from their list to see if it overcomes the problem!!!
Phones which experience these compass issues with the RC should be removed from the compatible list - it is not the phone manufacturers fault because they did not design their phone to work with a DJI drone, however, DJI designed their drones to work with mobile phones and at the very least should ensure the phones they recommend actually work with their equipment.
Further more the Mavic Mini marketed as a small, compact portable drone you can take anywhere, but this changes as soon as you need extra accessories ie. phone/tablet mounts to overcome the problems DJI have failed to mention.
The Aircraft Orientation (which is on all of the DJI apps and there for a reason) is a safety feature so at a glance you can check the direction (is this not true?) because in VLOS it is possible to lose orientation and the Mavic Mini is a very small drone, and anyone who says the loss of orientation has never happened to them deserves a medal because I am not ashamed to admit it has happened to me and that is with experience of flying RC aircraft for over 45 years that require far more skill than flying a drone - no computer technology to help you!
It is all about safety and it seems the reaction from some of the more senior members in this forum are prepared to tell people to ignore this feature because it does not work, but they are very quick to tell people they should be flying safely. They are also very quick to say they are "experienced" drone pilots and do not use this feature which is their choice, however, the majority of people expect the product to work as advertised without the need to open and close the map view to check orientation.
