Events are blocked or slowed down after a while

Hi Jens,
I added this line in /etc/apt/sources.list:

deb [trusted=yes] https://dl.bintray.com/tango-controls/debian stretch main

Then I did:

sudo apt update
sudo apt install libtango9lts-dev

This installed the include files under /usr/local/include and the 9.3.3 lib under /usr/local/lib on my Debian Stretch VM.

Hoping this helps.
Reynald