What's the version of 0ad she's using? Are you 100% sure it's r28? Can you confirm that it worked with the same internet connection before? What's the name of the internet service provider? If you can test, does it work when using another internet service provider? When running "certmgr.msc" and selecting "Trusted Root Certification Authorities" -> "Certificates" in the left pane, does the list of certificates contain one or more containing "ISRG"?

I don't think I got like any upgrades for them, so that would make sense. Should I start a forum in the art forum section to see if anybody would want to help?

They need to be OP because Sparta literally doesn't have anything else that's good, lol. Their siege is especially pathetic.

Did it start happening then  ?

Just rome though right? No one else should have p4 at moment.   Spartiates are pretty good once you mass them, and you need to phase up as they get some phase up bonuses.  Otherwise they mighjt be too OP if they had all their regular stats in p1