iPhone getting unreachable while Android does not

Friends,
We are facing issues specifically with iPhone, where it is getting unreachable while Android does not in both CSFB and VOLTE mode.

The issue is like if a phone is left in Idle mode for a while, say 15 minutes, then it gets unreachable. However if an user is using data then it doesn’t show issue.

If anyone of you have gone through this or any clue then kindly support.

There was a bug in ios sw and should be recovered in last update: Sudden Loss of coverage.
It got corrected in 13.2.2

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