Ubuntu 19.10 with all updates up to date. Today froze 2 times already (never happens in the previous year of using ubuntu 18.10, 19.04, 19.10).

A laptop with the screen closed, 1 external monitor plugged in via HDMI. NVidia + Intel GPUs. Wireless mouse + keyboard. 

After the freeze both wireless and laptop controls do not respond. The only work-around is to press the power button.

The only possible meaningful message in `syslog`:

> 
> /usr/lib/gdm3/gdm-x-session[5915]: (II) event4 - Telink Wireless Receiver Mouse: SYN\_DROPPED event - some input events have been lost.
> 
> 
> 

Some possible helper links found:
- <https://forum.manjaro.org/t/desktop-gnome-frequently-get-frozen-few-seconds-and-works-again/81603/20>

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Any clues how to diagnose this?