When I travel from an area that has 4G into an area that has 5G or vice versa the audio on my phone will sound like Donald Duck and on calls, I am unable to hear the person on the other end.
There is a work around for this issue, removing the sim card and replacing it. However, before I figured this out I got stranded at SFO at midnight unable to use my phone.
Your 5 G network is wreaking havoc. I know I'm not the only one having this problem.