This type of symptom is 99% of the time caused by something on your setup that's interfering with your dongle, make sure to bring your receiver at least 20cm in front of your mouse, and remove any wave-emitting devices close by (Bluetooth products, Wifi Routers, etc). If it were a sensor/MCU/firmware issue, it would also occur on wired mode too, not just wireless mode.
Also try checking that it's not an issue coming from your PC, by using a different USB port (3.0 or higher, if possible) and a different PC.
If you are using 4000Hz (4K dongle) or 8000Hz (8k dongle), this could be due to an overload, as your mouse is sending too much data to your PC, and your PC cannot process it quickly enough. Try removing other high polling rate devices from your PC, lowering your polling rate, or use a more performant gaming computer that is compatible with 4K and 8k polling.
If the issue persists even on the lowest polling rate setting and without playing any games, then your received might be defective. If you have a valid warranty, please contact your seller as soon as possible. Otherwise, you may also be able to purchase a new receiver on our website, depending on your mouse model: pulsar.gg/collections/dongle.
If replacing the dongle does not solve the issue, it may be that your mouse is defective. In that case, please contact your seller as soon as possible or submit a ticket on pulsar.gg/support.