System Randomly Locks Up

[rebeltaz]

I have nbzget v21.1 installed under ubuntu 20.04 LTS using the newshosting server. Up until a week or so ago, everything worked great. Now, almost every time I let nzbget download and process any nzb file, the entire system locks up and I have to physically power it down and back on again. I thought it was happening when nzbget was processing one file while downloading another, so I paused everything and let it do one binary at a time. It worked fine for one file but the very next one froze the system again. This freezing does not happen unless the nbzget daemon is running AND the program is actively downloading/processing a binary file. Is there anything known that could be causing this?