To increase the amount of time vCenter will waiting before marking a host as disconnected (default 120 seconds), modify the following parameter in vCenter:
config.vpxd.heartbeat.notRespondingTimeout
To increase the network adapter utalization percentage before VPXA will cancel management traffic (default 80%), modify the following parameter on the ESXi host:
/config/Net/intOpts/TcpipTxqMaxUsageThreshold
To decrease the amount of time that VPXA will cancel management traffic after the utalization limit it hit (default 70 milliseconds), modify the following parameter on the ESXi host:
/config/Net/intOpts/TcpipTxqBackoffTimeoutMs
Alternatively, you can keep this issue from occurring by decreasing the amount of traffic being passed over the networking adapter used for management traffic.