XR500 drops internet

All of my support has been done through this community.. but basically around 8pm-2am every night my internet crashes and comes back on almost instantaneously but just enough to throw me offline and not be able to play. I’ve noticed the issue usually happens when there are multiple devices connected to the internet at a time, I’m at my wits end. Never had this issue until I switched to the nighthawk and now I’ve had nothing but issues with it, I’ve never had such serious internet issues in my life. I’ve been dealing with this for 4 months trying to get support calling netgear calling my isp asking for help on settings with my router, I’ve updated firmware with one of you, had the lines to and around my house checked. You name it I’ve tried it and I cannot figure out what is wrong. I’m not upset with anyone cause I know these kind of issues happen with technology I’m just asking for more peoples opinions at this point trying everything I can before I just up and drop another $350 on a router. Thank so so much!