Error Codes 216 and 721

I have repeatedly and consistently had issues loading into multiplayer/online games in BF2. I'm not sure what changed as I used to be able to play easily and without issue, but now I cannot load into a match because I constantly get kicked out on both Xbox and PC (they're also 2 different EA accounts since I share my steam). I'm unsure of what to do to solve this issue, as I've tried most of the things that the troubleshooting page suggests, but nothing's working. I've been able to get into a grand total of 1 match out of over 30 attempts