Appliance Repair Questions? Ask a Technician for Answers ASAP
The back of the fridge wet with water would suggest an increase in condensation. This is often caused if the fridge defrost element is running which sits behind the back plate, if the door has been closed (which may be due to a door seal) and the fridge has warmed up, or the thermostat is not regulating the fridge temp correctly.
You best to start by checking the door and seal are in good shape, if they are do a 24 hour defrost, dry the unit out, then turn it back on and see if the issue improves, if you notice the same issue in the following days its likely the temp sensor, will need to be replaced.
If you would like me to recomend someone to come out to look at the the sensor please provide your postcode.