DHCP Lease Renewal too short

Hi all,

I frequently broadcast livestreams and/or participate in long video calls, and I deal with intermittent disconnects on regular short intervals (30 minutes, usually). After extensive troubleshooting, I have isolated the issue to unusually short DHCP lease renewals on Xfinity's end. 

I would like to get a longer DHCP lease from Xfinity (maybe 24 hours?) so that these micro-disconnects don't seem to happen as often. 

Similar issues from this forum: 
https://forums.xfinity.com/conversations/your-home-network/dhcp-lease-renewal-only-1h27m-every-time/6269f6c436b3dc41e2a6d455
https://forums.xfinity.com/conversations/your-home-network/at-the-end-of-every-month-my-wan-dhcp-lease-gets-reduced-to-2-hours/65640e7993c02b495090a0a2
https://forums.xfinity.com/conversations/your-home-network/very-short-wan-dhcp-leases-and-internet-disconnection-on-every-lease-renewal/63e1eea3b03aac5c8e4351a2

Does anyone know the right question / people to ask to get Xfinity to do this for me? All customer service scripts are just about troubleshooting my own equipment which is obviously not causing this issue. I have substituted in different modems and routers and even plugged a computer directly into a modem just to be sure, and, it has nothing to do with what equipment I have plugged in. The client does not control when DHCP WAN renewals happen, obviously.