Honda 2 Wheelers India — bikes stops when I slow down

Address:

Salem, Tamil Nadu, 636009

Using activa 3g for 17 years. Recently my vehicle is getting stopped when i slow down the bike. I have given service frequently as 3 times in 20 days interval. It works for first 3 days after that the vehicle stops again when i slow down.
Bike number tn30 ak2707.
Service center : triumph enterprise, omalur main road, swarnapuri, salem, tamil nadu.