I have a S5 Max for less than a year and everything worked fine until today. When I do my regular cleaning routine, I noticed that my device stopped moisturizing the mop pad when the water tank is still 2/3 full. The mopping function working totally okay when the water tank is full. I followed the troubleshooting instructions and check the airholes and water holes but can't fix the problem. My firmware is updated to the latest version. Does anyone encounter the same problem?