AR750 Slate, iPhone tether, random but consistent disconnects

Hi all, noob here, but using this with my iphone to tether. I’m getting fine speeds but every 15-20min or so it randomly drops connection, almost as if rebooting. Plugged into a proper power source using the right cord. (my firmware is updated). Any settings I can go in and change to avoid this issue? I need more reliability. might return product

Power and cable is still the correct way to get it working stable.