1.check your internet speed
2.download this application
3.Go to launch band selection
4.go on thre dot left to network
5.Select band LTE B3 work for me you can use LTE B5 or LTE B40 or others for jio users. Then enable selection
6. Now compare internet speed now and then
Mine speed difference
Before
After
After the last update I think network has been stabilized,earlier it used to happen to switch back to 2G connection on its own and I have to change it manually to 4G, although speeds are speeds not that great but it's doing the work for me. 
