My calls keep randomly go through Google Voice
Does your phone reroute your calls to Google Voice, or do your calls get rerouted on the recipient end?
I think you’ll be better off seeking help on this on Google forums, as it seems to be a Google issue (with your network), not an Apple issue (with your phone).
https://support.google.com/voice/answer/165221?co=GENIE.Platform%3DDesktop&amp;hl=en