I was having an issue with my Razer Deathadder V3 where it would stop responding to any mouse movements for anywhere from a split second to a few seconds at a time. Very frustrating. I found out I was running old firmware, so I updated the firmware for my dongle and my mouse. This did NOT fix my issue. I cleaned the sensor with some alcohol, but this didn’t fix my issue either. I was on the verge of buying a new mouse, when I randomly tried something in the Razer Synapse software and, so far, my mouse is now working fine.
Under the Razer Synapse software, in the config section for the mouse there is a mouse pad surface calibration. In there it shows you how to reset it. I did this and so far, my mouse is working great. Hold the left mouse button, right mouse button and scroll wheel button all together for 7 seconds and it resets it. This fixed it for me. Try it and see if it works for you.
