Calls regularly cut off - Galaxy S7

Since the beginning of december my calls are randomly disconnected. I can’t hear anything anymore and neither can the other person. It can be after 40 minutes or 3 minutes. The call window stays open. I think it is getting much worse these days. How can I troubleshoot / get some help about this please?

I've been advised to generate logcat files but I don't know how to do that. Could you help please? https://community.e.foundation/t/calls-regularly-cut-off/1523

Thanks,