console connection lost

[FransM]

ESP32 S3 wifi version

After boot I can connect to the console using ttyACM1 with baud rate 115200. However the connection is dropped after 2.5 minute.

The shell is not closed; If I start this shell script:

while true
do
date
sleep 1
done

The script remains running. When I reconnect to the console it is still printing the date. but after 2.5 minute the connection is dropped again.

No idea what causes this.

It seems that with more activity on the console (me typing) the timeout happens faster.