Sandboxie and Opera

Hello, I am having a Problem when using Opera with Sandboxie. I start Opera in a Sandbox and after 30-60 seconds it just closes and opens up again at the start.

My Opera version is 68.0.3618.125 and Sandboxie is 5.33.6 (64-bit). Windows 10 with latest updates.

When I run Thunderbird or Windows sandboxed everythin is ok.

What could be the problem and where could I even start to solve this?

Thanks, David