Signal strength drop when call is placed

Liftdr
Newbie

I have a Note 5 that recently started to drop signal strength upon placing a call. I will display good to great 4gLTE signal but as soon as I push the talk/call button it drops down to 1 bar of 1x?  It happens in all cities I'm in so I can't imagine it is a tower issue.  Anybody else have this issue?

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Tidbits
Legend

Did you turn off advanced calling or removed the feature?

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