Redmi 4X USB tethering disconnects at midnight - General Questions and Answers

Hello,
I use a Redmi 4X as 4G modem connected via USB tethering to a FRITZ!Box 4040.
It works very well but every day since midnight the devices that use this connection can't browse. What I see is that the connection indicated on the status bar of the Redmi goes from 4G to H+. The only way I found to allow the devices to browse again is to reboot the Redmi or to turn its aeroplane mode on and off.
Is there an option to turn off this behaviour?
MIUI Verion 9.6.2.0
Android version 7.1.2
Thanks in advance,
ian

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