Umbrel v0.3.14 is now out which resolves the bug that caused Umbrel to randomly disconnect from the network and become inaccessible. Just login to your Umbrel to update!
Sorry for this issue, guys! I know it’s been quite frustrating for some of you. Thanks for bearing with us and helping us debug the problem.
PS: If you’re interested to know what exactly the bug (and the fix) was, check out @lukechilds’s tweet thread.