Sorry, I did a Mistake.
Before replacement, I found two copies of that file vmnat.exe. One located in C:\Program Files (x86)\VMware\VMware Workstation and  the other in C:\Windows\SysWOW64 . I thought.. I replaced both. However I just have doublechecked. For some reason the syswow64 still had the 17.5 version. So, I replaced that file for the 17.0.2 version.
I have been monitoring cpu usage (two hours) using two WIndows 10 guest VM. No vmnat issues showed so far.

 

Thanks