Camera not recording

Since around 12pm yesterday our stick up cam hasn't been recording footage and for a few days won't show live view. We've reset everything and our WiFi is working fine. Event history shows its picking up movements but can't record. We've not had any problems with it before. We have a second camera which works fine and goes to live view within seconds. I've checked that the settings are the same on both cameras and I'm at a loss as to what to try next. Any suggestions or do I ask for a replacement under the warranty?