Randomly, calls get auto forwarded to voicemail (Virgin Mobile)

Curious if anyone has experienced this and has a fix. I did a search on google and on here and saw cases where ALL calls were not ringing/straight to voicemail but that's not the case for me.

It's happened at least 3 times where the person calling, while it's showing LTE and I'm connected to wifi, it doesn't ring at all but it goes straight to voicemail without even showing up in the call logs. Could happen a few times and then eventually they get through and my phone finally rings. I tested it yesterday with a friend calling me and calling from my fongo account, both times it rang fine so it's very random.

It's just really annoying because right now I'm job interviewing and happened twice already with interview calls.

I used to never have this issue with Rogers, same exact iPhone 8 and same exact settings.
I called Virgin Mobile and they gave me a code to type in and I got this message setting activation failed voice call forwarding when unanswered but not sure what that means....

Is this a Virgin Mobile specific problem? Is there anything they can do? Anything I can do? I've already 1) rebooted 2) remove the Truecaller app (which I've always had even when I was with Rogers) 3) ensured call forwarding is off