android 7.1

Hello all Since installing MIUI 9.2 and 9.5 from MIUI 8.5.5 I've seen a sudden spike in daily network downloads. I've isolated the culprit to Android OS, but I can't work out why. about 50-100 MB per day is used from either my data or WIFI connection on just this alone. I have the Mi5c. Thing's...