In kernel audiutor disable MPDecision under CPU hotplug and you'll get no more audio stutter.
It's such a shame that Xiaomi does not fix this long known problem.
I had the same problem updating to V7.1.1.0.LXACNCK, at the end I used the chinese official miui V7.1.1.0.LXACNCK through the updater app and after it worked I updated to the Xiaomi.eu version.