Hi fireballtool,
It is odd the same artifact is showing on multiple computers, but it isn't showing when you playback the footage on the camera. Typically if the camera or card are saving the footage incorrectly the artifacts should show when you play the clips back on the camera too. There are a few things to check.
The first is that is you used the same card for all the clips it would be good to try loading a different card in the camera to see if the same thing happens. Also if you used the same card reader to transfer the clips to each computer it would be good to try a different card reader. Sometimes if the reader is malfunctioning it can cause issues like this.
If you used the same NLE program on each computer it would be good to try a different NLE to see if the same artifacts are showing. One last thing to double check would be to try recording are a few different resolutions and frame rates to see if the same artifacts are coming up.
If the artifacts are still happening in footage at that point we would recommend sending the camera in for repair. If you send it in make sure to include a copy of the proof of purchase in the box. The technician will need that to verify the warranty.
The Canon U.S.A., Inc. online repair portal 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 portal to arrange for service:
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.
