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Yep, I've looking for this problems exactly. I can confirm it causes problems. People who doesn't have problems maybe have a diferent kind of cover + magnet. Weak magnets or something. My cover magnets are like one on one side which attracts the other end of the cover where the phone is in the middle.
I'm having exactly that kind of issues:
- Sensor to detect my face to turn of the screen doesn't work with the cover on. I tested in the same call 4 times. I take the phone of the cover -> sensor works flawlessly; I put the phone in the cover and the sensor never works. Result: I touch my screen with my face during my calls and I open so many things at the same time sometimes that it causes a call.ui app error (the call screen where it shows the contact and it let's you turn off the call and the other call options disappears).
- Compass doesn't work with cover on. I have an app to see the sky and the stars on which when you move the phone and point it to the sky it points exactly to the same place in the sky and shows that part of the sky in the screen with the stars and planets and that kind of stuff. With the cover on it doesn't work, that system because it uses the compass on the phone. Without the cover it works flawlessly.
- The battery discharging faster I can't confirm because I have always used this cover. I will use a cover without a magnet now and I tell you guys something later.
I even activated my phone's warranty for this. They haven't detected any problem in the phone. When they've sent it to me it seemed fine but the face sensor didn't work sometimes but I was not getting the call.ui app error maybe because I was making an effort not to touch the screen with my face and open lots of things at the same time. Today I got that error 2 times and I came here to search this. They haven't detected any problem in the phone because I sent it to them without the cover (ofc).
Another thing is that I permanently in contact with 3 more people that bought this same phone in the same day as me. 2 of them don't use this cover neither any cover with magnets and phones are fine. The other uses this same cover as me and has the exact same problems as me plus a problem that the phone calls to people in his contacts when he is in the middle of a call with another contact or right before he hangs up the call he is in. Maybe that is because he doesn't make any effort to don't touch the screen with his face (because his screen is perma on in the calls - the sensor doesn't work) and ends up opening the contacts (with his face) and calling somebody (it's always someone that is in the first screen - recent contacts).
Phone: Vodafone Smart Ultra 6 (from Vodafone Portugal)
Cover: http://www.amazon.de/gp/product/B015CTP94U?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00
(Note that this cover has one magnet in the front end which "attracts" the magnet on the back part of the cover which makes all worse in my opinion)
EDIT: Note that there are covers where the magnets are both on the front cover part and directly atract each other and touch each other directly which may not cause issues. Also it may cause problems in some phones and not the others. My cover is mega magnet everywhere. It goes from one side to the other, the "contact" between the magnets. It is "magnetizing" (lol, hope you understand what I'm trying to say) the inside components of the phone in the right side of the phone when you are looking at the screen (cause is where the magnets are). Maybe also depends on which kind of components each phone has in the place where the magnets in the cover are placed.
(I'm portuguese. I created account in here just to write this. Sorry for the english and I hope you understand everything I wrote as it was all extensive detailed explanation so I needed to have advanced english for this. I have self-taught english only from playing online videogames and watching american and british movies in the last 25 years, 
)
