Worsening ping over time while gateway is left on

I recently got TMHI and the Arcadyan G4AR gateway. I've noticed that whenever I leave the gateway on for an extended period (4-12 hours), the latency gradually worsens. When I first start the gateway, the ping is 60-80ms with jitter less than 10ms. However, after a few hours, the ping suddenly increases to 100ms or higher, sometimes even reaching 500ms+, with jitter around 200ms. Restarting the gateway resolves the issue, and the ping returns to the initial 60-80ms range with low jitter which makes me think its a gateway issue. I have to constantly restart the gateway, which is inconvenient. Is this a known issue with the G4AR gateway, and is there a way to fix it without frequent restarts?