Xiaomi has fixed the dual-SIM issue that had been affecting some Mi A3 handsets almost as quickly as it caused it. The fix, which arrives courtesy of a new build of MIUI 11, is rolling out now. Understandably, fans and owners of the Mi A3 are unhappy at Xiaomi's repeated missteps with issuing software updates to the device.
https://www.notebookcheck.net/Xiaomi-fixes-Mi-A3-dual-SIM-problem-but-many-fans-remain-unhappy.481431.0.html
Thank you Xiaomi for bringing back update again..
Xiaomi company is very unsatisfied with their Mi A3.....it a worths ever I used .... should be band totally..
Very bad experience,when I'm in call then automatically reboot phone, so many times / every day facing the issue ,the Xiaomi customer service are worst experience .pls update new version