I've tried the latest stable Global ROM for the Mi MIX 2S (10.3.3?), but had the same problems. I have an XA model, but cannot use global ROMs because the 8/256GB XA model was never intended to be sold here in Germany. I was an early adopter and I deeply regret it. At the time I bought my Mi MIX 2S 8/256GB XA model there was no official distributor for Xiaomi in Germany and Xiaomi recommended I should have bought my Mi MIX 2S from an official distributor. Then it became impossible to lock the bootloader when using a non-Chinese ROM. Then the Mi MIX 2S SAR issue became official and from that moment on my Mi MIX 2S had severe connectivity issues.I don't have any kind of probs on latest global stock. Voice & GPay working fine. Is it problem of EU-rom?