Hello, I have not yet had this error message with C225, but I know something like this from other devices, such as Dashcms. It is very difficult for normal users to find the cause. Sometimes it helps to reformat the SD card with a PC and then repeat the formatting in the target device, in this case C225. If this does not help, the only option is to replace the SD card, which can usually be used in another device without any problems. Good luck

Whether you are at home or on the road doesn't matter, maybe you have intercepted your SD card from abroad via mobile data, that could be a possibility, I myself format the SD card from time to time and have never had any difficulties, at home you only use it via W-LAN.
I hope I could answer your questions, and have fun with your camera !!!