Actually many people have this prob and i guess it may be MTA prob.I am playing MTA from 1.5 years and this is the first time i am facing this prob.So let me explain how it happens:
I was playing normally 2 days back and suddenly my ping rises from 180 to around 300+,first i thought it was due to mods so i downloaded a new GTA and i re-named the one i used earlier then i start getting this prob.I have changed my windows 2 times nothing happens all drivers are up to date and GTA SA is also working fine.
Here is report of process monitor:
http://upload.mtasa.com/u/360914395/Logfile.PML_