I have been trading since 8 yrs. Have used Religare Race Pro, India Bulls PIB. Never had any issues either with Inter Net or with Software. Even now I am using ODIN and Zerodha Trader. ODIN never has any problems. FYI it is 15yrs old product. According to current generation it is junk.
It is high time Zerodha should stop blaming others for their inefficiencies.
Barring low brokerage, there is no fun in using Zerodha. How Long we grit our teeth and bear this crap, God Knows.