I know you can setup the RPI 4 to run 100% off of USB.  Once that was setup you could install linux and install Umbrel on top of that.

I am assuming you can do this with  umbrel? 

BlokchainB

I had the exact same issues when I was running the OS off an SD card.  I'd give it another go with booting off a USB -> Sata adapter with an SSD attached.  

021da48107

bitcoin

Low Time Preference Routing Node | Spend and Earn Sats

bshell

I could never pinpoint the issue. I would even hook up a monitor to my pi to see if could troubleshoot but the only thing that would get my node back is a power cycle.  SSH wouldn’t work nor would accessing it via the LAN. 

I should have tried re-flashing the SD card but I just got tired of it going offline. Maybe I should use the same pi start completely fresh and see if I have better luck but a part of me thinks if I am going to be serious about routing then I should get better hardware in general 