Hi.  I see below errors my logs (upper right icon).  Downloading diagnostics under tools doesn't finish, hence I can't attach them here.

 

Mar 22 13:23:41 Tower kernel: nginx[10974]: segfault at 0 ip 0000000000000000 sp 00007ffec84299d8 error 14 in nginx[400000+21000]
Mar 22 13:23:41 Tower kernel: Code: Bad RIP value.
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [alert] 9032#9032: worker process 10974 exited on signal 11
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [crit] 10977#10977: ngx_slab_alloc() failed: no memory
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: shpool alloc failed
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: nchan: Out of shared memory while allocating channel /disks. Increase nchan_max_reserved_memory.
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: *302553 nchan: error publishing message (HTTP status code 507), client: unix:, server: , request: "POST /pub/disks?buffer_length=1 HTTP/1.1", host: "localhost"
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [crit] 10977#10977: ngx_slab_alloc() failed: no memory
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: shpool alloc failed
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: nchan: Out of shared memory while allocating channel /shares. Increase nchan_max_reserved_memory.
Mar 22 13:23:41 Tower nginx: 2020/03/22 13:23:41 [error] 10977#10977: *302554 nchan: error publishing message (HTTP status code 507), client: unix:, server: , request: "POST /pub/shares?buffer_length=1 HTTP/1.1", host: "localhost"
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [crit] 10977#10977: ngx_slab_alloc() failed: no memory
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: shpool alloc failed
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: nchan: Out of shared memory while allocating channel /cpuload. Increase nchan_max_reserved_memory.
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: *302555 nchan: error publishing message (HTTP status code 507), client: unix:, server: , request: "POST /pub/cpuload?buffer_length=1 HTTP/1.1", host: "localhost"
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [crit] 10977#10977: ngx_slab_alloc() failed: no memory
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: shpool alloc failed
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: nchan: Out of shared memory while allocating channel /disks. Increase nchan_max_reserved_memory.
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: *302556 nchan: error publishing message (HTTP status code 507), client: unix:, server: , request: "POST /pub/disks?buffer_length=1 HTTP/1.1", host: "localhost"
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [crit] 10977#10977: ngx_slab_alloc() failed: no memory
Mar 22 13:23:42 Tower nginx: 2020/03/22 13:23:42 [error] 10977#10977: shpool alloc failed
 

I think it's pretty much telling you. You've run out of memory.

Make sure your VM hasn't been allocated more memory than what unraid and your vm need + overhead.