@bwsmith33071I guess I know how it feels to face this kind of Solo Battle DNFs. I had 29 DNFs in Madden 20 and close to 20 in Madden 21 already, playing on PC too. A while ago I wrote about my lessons learnt in this forum about how to decrease the frequency of facing DNFs. (although I wrote it in another context, see https://answers.ea.com/t5/Bug-Reports/Why-am-I-getting-constantly-DC-GLITCHED-I-CANT-EVEN-PLAY-A-GAME/m-p/9956794#M8684)
Regarding facing DNFs after finishing the Solo Battle, I faced this pattern multiple times. sometimes I realised that my upload speed was zero (for whatever reason) and the game could not upload my result. sometimes it was just due to a (very) short disconnect or desync issue happening at the end of the game. I'm European and I guess that a lot can happen somewhere between my PC and EA's servers. That's really frustrating because I cannot do anything about it.
At least, my steps to reduce short disconnects due to my router/cable/modem seemed to improve my situation regarding disconnects/desyncs. I'm still facing DNFs much too often but I'd estimate that about half of my 20 DNFs this year happened due to a game crash (when playing on my laptop (instead of my PC) and a turnover occurs. I have no idea why the game crashes since I can play any other mode without issues...).
I've gotten used to the fact that I have to expect a DNF at any time. it's still extremely frustrating, but there are more important things in life...
I hope that my lessons learnt will help you to reduce the amount of DNFs. good luck!
EDIT: I'd like to add that I'm able to rank top 10 in Solo Battles (if I do not face a DNF. and no, I do not exploit glitch plays!). at least it comforts me that at least one other player gets to enjoy the top 100 rewards when I invest vast sums in my psychotherapists again because of facing a DNF .... 😉