Malignant XC90 3.2

Hello, with my XC90 3.2 there are recently misignitions. I get as error in BC the display slowly driving or up. After the vehicle was in emergency run I brought it into the workshop. here as error the misignition on cylinder 3, 4, 5, 6 occurred. It was checked compression, fuel and everything necessary like cabling etc.. However the error did not reproduce. After I drove now another 50km the same picture misignitions, power loss BC message etc. however after restart everything with the old and again i.e. my question has now made some similar experience with this engine and an idea what it can be. Ignition coils can be excluded here. It must be a sensor problem or the like. Thank you all Greetings