Browser stops on DSI touch screen

[Rob67ert]

Hi,
I have Dashticz running on a Raspberry Pi 4 with a 8" DSI touch screen.
Everything works great if I open the Dashticz screen in e browser on my PC.
But on the DSI screen the browser stops working after a few hours, while it still runs on my pc.
Anyone know what the issue could be?
Already tried with chromium and Midori browser, both the same problem.