Server crashing several times per day

[toytown]

If the entire server becomes inaccessible, then this will most likely be a hardware problem rather than software. Jellyfin crashing will not bring down the server. I would personally look at running MemTest (https://www.memtest.org/) from either a bootable USB/CD/DVD for at least 1 day to see if any memory issues occur as the first thing. If this passes then post back and hopefully we can start testing cpu/gpu/psu etc.