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Try disabling stuff that runs by using autoruns   formerly from sysinternals..
You can disable by unclicking a checkbox for what ever you want... and then reclick everything you disabled before to return to normal.
Since hardware doesn't seem to be an issue try looking for a software issue.

Thanks for your reply..
My ISP Router is a G3100 from verizon.  I have the firewall turned on, fixed IP addresses on the three ports I use. Other than login changes and IP address reservations I haven't done much with it.
Both my IOT and normal networks use Asus home routers with their firewalls enabled, some reserved IP addresses and I keep the firmware updated.
I was mainly thinking the ubuntu server being on the ISP router might be making my home network less secure.
I have purchased two TP-Link TL-SG108E switches to learn about vlans so if I need to change my Linux server's connections that may be an option for me... but I am no network guru... most of my experience is hardware based and windows OS experience. I am learning linux and really liking what I am learning about it.
Thanks again for your help.

My basic setup is this:
1 - ISP router, wifi turned off, port 1, port2 and port3 are set to fixed IP's on 192.168.x.1 , .2, .25
2 -Home router secure network , dhcp address ranges 10.0.3.40 - 3.254 , Wan Port fixed to 192.168.x.1 - From ISP router port 1.
3 - Home router IOT network ,  dhcp address ranges 10.0.4.2 - 4.254,  Wan Port fixed to 192.168.x.2 - From ISP router port 2
4 - Mini Ubuntu server running Adguard and Jellyfin media server, IP address fixed to 192.168.x.25 - From ISP router port 3  and
this IP is set for DNS on both home router networks ( ADGuard )

I have dual NICs in my ubuntu server with only one being used.

Is there a security risk since both of my networks use the IP address of 192.168.x.25 as their DNS server for Adguard?