Windows 11 Thinkpad Bluetooth problems when using a Mediatek MT7921 WiFi/BT device

I'm the proud owner of a brand new ThinkPad P14s Gen2 AMD running Windows 11 Pro (upgraded from stock Windows 10 by the reseller). I have a very strange problem: As soon as the PC enters/wakes sleep mode the Bluetooth adapter 'crashes' and is thusly uninstalled from the device manager tree by Windows. Instead a faulty USB device is shown: “Unknown USB Device (Device Descriptor Request Failed)” All this can be reverted by uninstalling both(!) the faulty USB device and the WLAN adapter (which works like a charm), shutting down and restarting (no reboot, that doesn't work). After this procedure B

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