Firstly, try making a backup of your current image with an image software or our image burner plugin.
Does the localhost have the same IP and if so, does the url „localhost/“ get you access to any interface?
Also, does your system run 24/7 or do you shut down the Pi? If so, do you click „shutdown“ in the webinterface before doing so? While the write proctection does make your card more robust, continuous manual shutdowns might still damage it.