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I think I’ve gotten to the bottom of this. I was going to try safe mode, but I needed my plugin to pass through USB devices (didn’t want to reinvent the wheel). I booted in GUI mode and logged in. When the issue started happening, I was able to get the terminal up after many attempts and it took about 5 mins to load…then I was able to run HTOP. Ultimately, I built a new VM the other day and allocated it 16GB RAM and have 32GB in the system. Docker was using 18.6GB, ZFS was using 4GB, then my VMs were using 25GB more. Ultimately, I over-allocated memory. I was thinking it would share memory like CPU but I guess that’s not the case. Lowered RAM allocations and it has been stable without the php-fpm errors for several hours.