Funnily enough I get a similar issue with Roon Bridge restarting every 86 minutes or so on a Raspberry Pi.
Doesn’t matter what OS is on the Pi (used Moode Audio, RaspiOS and Ropieee) nor does it matter if the Pi is connected to the network via Wi-Fi or Ethernet.
The Roon Server running on my Ubuntu server is fine, all other non-RAAT endpoints are fine and will continue playing while Roon Bridge on the Pi just restarts mid-play with journal messages as below.
Can also output to the same Pi via Airplay (using Moode Audio) and no interruptions.
I’ve started a new thread here on my issue but this thread might actually be the same problem.
It think it might be relevant that I also have an Asus AC68U router.