Mouse decreases sensitivity dramatically for short period

Hi everyone, I've combed the internet and can't seem to find a solution to this. Both in and out of game my razer viper will dramatically decrease its sensitivity to less than a third for about 5 seconds. It returns to normal without my having to do anything else. I've tried reinstalling synapse, disabling synapse, changing the mouse profile to only have one DPI setting, and I cannot find a solution for this. I've monitored input lag and system usage and neither seems to be correlated with this issue. Please help!