JyotiGhatak is it switching to 4g?? Most users face this problem…
if you’re using jio then try turning 5g only mode dial *#*#4636#*#* >phoen info>select phone0-1 according to slot you’re using>scroll down and select NR only instead of NR/LTE/HSDPA then your problem will be solved (I’m using it in 5g only mode)
And if you’re using Airtel then it’s 50/50 chances that this works.. because airtel doesn’t using 5g standalone… airtel using it’s 4g network for 5g so… you’re stuck with it.