DELL XPS 15 9550 - Partially BIOS

I habe a dell XPS 15 9550 and after installing kubuntu as a dual Boot System, i Got this issue. Nowak i habe to do the following Workaround everytime i use my notebook.

1. Start the notebook via Powerbutto
2. Hitting the F2-Key like i was fighting an endboos.
3. Seeing the BIOS menu in just a 2 - 3 inch hight line.
4. Pressing "ESC" to Restaurant the System without doing an changes.
5. The System starts totally normal

I also upgraded my ram to 32GB, buhlt in a 512 GB nvme pci-ssd from Samsung and a 512 GB normal ssd from Samsung. And I also changed to AHCI in BIOS.

Any sugesstions?