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I m using also airtel 4g but the problem is conversation of 4g to 3g to +H and speed of internet also gose on bits
Check whether you get VOLTE signals in your area or not. If yes then open dialer and dial *#*#4636#*#* and select netwok preferences to LTE only. This might solve your issue.
Actually, this network drop happens when LTE signals received by your smartphone have poor quality index