This is the 1107th most frequent Portuguese word.
mesmos
"Mesmos" means "same" or "the same" in English.
Here, "mesmos" is used as an adjective to emphasize that the problems are identical to previously mentioned ones.
Os mesmos problemas continuam a aparecer.
The same problems keep appearing.
"Mesmos" serves as a pronoun referring back to a group previously discussed.
Eles são os mesmos que participaram da reunião anterior.
They are the same ones who attended the previous meeting.
"Mesmos" emphasizes the errors being consistent or repeated from past context.