[Xiaomi Mi Max ROMs, Kernels, Recoveries, & Other D] Gadgetguy2005:
Ok. So I just had the issue again. I was able to force stop Nova - that did not solve the issue. The pixel launcher had it too. But I was able to capture MatLog. Here is a relevant section, during which I pressed the home button many times:

06-01 15:04:33.245 D/AudioService(2041): Stream muted, skip playback

06-01 15:04:33.294 W/InputMethodManagerService(2041): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@5541add attribute=android.view.inputmethod.EditorInfo@8ecf652, token = android.os.BinderProxy@3df7a8

06-01 15:04:33.589 D/OpenGLRenderer(26656): endAllActiveAnimators on 0x7f78629000 (ListPopupWindow$DropDownListView) with handle 0x7f89fc66a0

06-01 15:04:34.487 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:34.557 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:34.740 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:34.742 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:34.908 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:34.959 E/ctxmgr (4450): [ProducerActiveIntervalImpl]closeActiveInterval: Error: ongoing, trying to close

06-01 15:04:34.980 I/PlaceInferenceEngine(4450): [anon] Changed inference mode: 105

06-01 15:04:35.031 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:35.065 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:35.220 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:35.627 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:35.939 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:36.231 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:36.241 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:36.429 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:36.532 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:36.600 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:36.787 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:36.798 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:36.996 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:37.106 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:37.194 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:37.421 E/QCOM PowerHAL(2041): Failed to acquire lock.

06-01 15:04:37.423 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

06-01 15:04:37.452 I/MSM-irqbalance(601): Decided to move IRQ203 from CPU4 [P:0] to CPU2 [P:1] (banned)

06-01 15:04:37.453 I/MSM-irqbalance(601): Decided to move IRQ200 from CPU4 [P:0] to CPU0 [P:1] (banned)

06-01 15:04:37.601 V/KeyguardServiceDelegate(2041): **** onKeyguardExitResult(false) CALLED ****

I am not sure what KeyGuardServiceDelegate(2041) is - but it seems that I get that when I press the home button...

And just another detail: I have not installed any new app with the new 7.1.2 version. I just did a clean install (wipe everything etc.) then I used titanium to re-install ther user apps..

Thank you so much for any suggestions.