Several lose & reconnect of all visible Sats within seconds

who has an idea why this copter suddenly loses ALL satellites and reconnects and loses again within seconds…(14:12:49). The UAS was transported from Germany to Brazil and the pilot didn’t recalibrated the compass before first flight there.
but I see no reason, because the EKF values ​​were still quite passable until that happened.
only the lack of activation of “moving base” ( RTK Inject )by the pilot I noticed, but is that really the reason …?
(PH2, Here+, AC3.5.5 , RTK inject activated)

Bin File

Thx for any hint !