Hi,
I'm using this library on a mkr 1010 to send some data every 5 seconds. I based my sketch on the WiFi Simple Sender example. After 1-2 hours the library stops sending mqtt messages to my broker.
For now i did the following observations:

1. the loop() code is still running
2. i'm still able to ping my arduino
3. my broker is still running, other devices on the network can still publish on it

The code is hosted on arduino create