I've been a happy, paid-up Enpass user for several years. I'm using it on several Linux machines - mostly 64-bit Xubuntu 16.04 and 17.10 and a 17.10 Kubuntu machine. All of the machines are configured to use Enpass from the PPA at http://repo.sinew.in/. They're all using Enpass 5.6.5.
Recently I've noticed that EnpassNMHost can get into a loop, consuming 100% of a CPU core until it's killed. I've seen this happen on at least three of the machines; the others could also be exhibiting the bug, but I don't monitor them as often.
What can I do to help you diagnose this issue?