[cf7777]

To fix Non responsive remote to wakup Mi box 3 with Pie 9 OS
Goto
▶▶▶Settings
▶▶▶▶▶▶▶Apps
▶▶▶▶▶▶▶▶▶▶Special Permissions
▶▶▶▶▶▶▶▶▶▶▷▷▷▷▷▷▷▷▷▷Energy Optimization

find following Apps and Uncheck

TV Remote Service
Bluetooth

Works Every nite now. Press Home button will wake up. press home once then wait few seconds,. and press home button again.