My kid loses one friend frequently and we have to re-add them. Is there a way to verify if this is legit or if he's rage unfriending?

So, we have 2 boys. B1 has an anger issue and rage quits things... Soccer, games, anything. He is frequently needing to re-add his brother, B2. I know I know, he has to be unfriending him. He swears it's not him and we've had this discussion time and time again. Sometimes we hear a tiff and then he asks to add his bro back;sometimes it's a new day and he asks when they start playing. Do I believe him? Not really. But, he says and I verified that unfriending takes multiple clicks/steps and he's not on that screen. Also, it happens and he asks to add him immediately so i kinda think if you're that upset you stop playing with him. B2 also verifies that this happens when they're not fighting sometimes. The only friend he loses is his brother. We have parental controls so we have to put in a code frequently to fix this. It's bothersome.

I googled and there has been an issue with losing friends but I can't find any answers to fix it.additionally, we've in the last month factory reset the switches so it happened before and after the clean install.

We have told him we think it's suspect. He generally owns up to his rage and we address problems, learn a lesson, and carry on. We've taken the switch away, we've separated them, we've paid close attention to the behavior via the playroom camera when it happens.

I don't want to call my kid a liar but it's an inconsistent problem that happens frequently.

Is there any way we can determine if it's him or if he has a technical issue? If it didn't happen at calm moments also, it'd be an easy judgement. I just can't see why he would unfriend when they're happily playing too, especially since it takes steps to do it meaning it doesn't seem accidental.

Look, we're working on the anger issue. We monitor and enocurage and have reasonable responses and ramifications to bad behavior. We believe it would be detrimental to make him the only kid in his friend group who loses access totally.

Is there a parental log with Nintendo where we can see him remove a friend? Is there an error log to see if he's losing connection and glitching or something else that might cause this?

System is Switch Occurrs 2-3 times a week It only happens with his brother. He's not asking to sneak and add others, we know his FN friends.

Yeah, it's probably him but I'm generally tech savvy and the inconsistencies around the timing don't add up to it being him every time. Thanks for the help.