Your error is a long standing bug in the rt2x00 family of drivers, while there should have been recent (master, not 18.06.x) improvements in regard, it's not quite clear if the problems have really been fixed. mt76 is a new driver for newer Mediatek chipsets, these should not be affected by the bug you mention - but they don't apply to your device (xiaomi mir3), only the newer mt7621/ mt7628 based SOCs (xiaomi mir3g) and their wlan chipsets.