dropped packets on vmxnet3 vsish

I am getting a lof of dropped packets on some vms when pinging them.

they are all using vmxnet3

but some vms are not losing pings on the same host. I isolated the nics and both nics on the vswitch are showing same symptoms

I did a vsish command and noticed rcsummary shopwing droppedRX

but not droppedtx

I went into the guiestos and pinged the gateway but no dropped pings

any idea?