There must be a memory leak in vsphere-client - I bumped the memory to 5 GB using "cloudvm-ram-size -C 5120 vsphere-client" command and the client still hangs after a couple of hours.

Service-Name            AllocatedMB     MaxMB CurrentMB  Curr-RSS    Cache  MapFiles   MemoryLimit

vsphere-client                 5376      5898      5898      2424     3474        12 8796093022207

TOTAL(RAM=18101MB)            18093     13926     14474      7562     7598       570 8796093022207