No, unfortunately not. Does your carrier support VoLTE? (Mine does not.)
Like it is shown in this thread?
If so, that might be a hardware (core module) issue. The screen connector had been revised with the latest batches, so your FP2 might be from an earlier batch produced.
You could disassemble the phone and see if either the core module or the display were bent slightly. Do neither use force nor pressure to straighten it out!! The risk of damaging other electrical components is very high! (You have been warned!)