VMware have released ESXi 6.0 Update 1a which fixes the issues noted in KB2124669 – ESXi 6.0 network connectivity is lost with NETDEV WATCHDOG timeouts in the vmkernel.log.
The update is available here.
Also, VMware have released ESXi 5.5 Update 3a which incorporates the patch for KB2133118 where Snapshot Consolidation caused Virtual Machines to crash.
Update 3a is available here
Hopefully vendors will released updated custom ISOs for both ESXi 5.5 U3a and 6.0 U1a over the next few days.