Hi llehmann,
I'm sorry to see your EOS R6 is freezing. As jaewoosong mentioned you may want to try updating your firmware to version 1.5.1. That update includes a fix to help with the camera freezing during focus. If you need a link to where the firmware update is available that is HERE. Once you are on the web page click on the gray Drivers and Downloads button and select the Firmware tab.
If the camera continues freezing after the firmware update there are a few things to check. The first is to try loading a different battery in the camera to see if the same thing happens. If that doesn't resolve the issue the next thing is to load new memory cards in the camera. If the camera still freezes at that point try attaching a different lens. Sometimes if the battery, memory card, or lens are malfunctioning they can cause a camera to freeze like that.
If swapping those pieces out doesn't resolve the freezing we would recommend sending the camera in for repair. If you send it in for repair make sure to include a copy of the proof of purchase in the box. The technician will need that to verify the warranty.
Canon U.S.A., Inc. has created a new online repair portal that allows you to set up service in a few simple steps. The repair portal gives you the ability to set up service for multiple pieces of equipment at once, and to receive a repair estimate in the majority of cases, depending on your model and issue. The portal also allows you to upload images or videos that will assist us in repairing your product. You can also select how you wish to be notified of the progress of your repair. The portal's service history section allows you to view all services that have been performed on any of your camera or video products since January 7, 2020.
Please follow the link below to access our online repair
https://mycanon.usa.canon.com/signin
Instructions for Accessing and Using the Online Repair Portal
You will need to access or create your My Canon Account.
If you already have a My Canon Account and your product is already registered, simply click on the “Get Repair Services” link on the left menu and follow the onscreen instructions to arrange for service for your product.
If you have a My Canon Account and your product is not registered, you must register your product first. Click on the “Get Repair Services” link on the left menu, then click on the “Register Product” link on the right. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product.
If you do not have a My Canon Account, you will need to create one. After you create your account, click on the “Add Product” link to register your first product. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product.
Once you have completed the repair request, you will have an opportunity to print a copy of the request for your records. This request form will also contain shipping instructions and an address label that you will attach to the outside of your shipping box when mailing your equipment for repair.
