Greetings bronzebird,
Sorry to hear that your PowerShot SX740 HS is having an issue with saving images. Usually, the issue is caused by the memory card where the memory card has been overused. The first step would be to suggest on performing a low-level format on the memory card. Please note that formatting the card will erase all photos from it. In case the issue persists, then we do recommend on testing a new SD card and to format the card prior to using it.
I would suggest to also reset the camera to factory defaults to see if this helps resolve the issue. Page 105 of the user guide will provide us with the steps on how to reset the camera:
https://gdlp01.c-wss.com/gds/1/0300031221/03/pssx740hs-cu2-en.pdf
In case the issue persists, then the next step is to suggest on sending the PowerShot SX740 HS camera to our facility for service.
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 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.
