Airtel — airtel slow 4g network issue

Address:

Mumbai City, Maharashtra, 400093

When i select 3g/4g network in my phone the network is not stable there is always up and down of signals but when is set my sim to 2g network signal is stable. I think that it is my phone issue but when i insert jio sim 4g network are full and excellent, so it is your network problem please fix it or slove. So i can able to use my airtel sim at 4g network. Please slove this problem