Lineup Ultimate Team Bug

I play on last gen on ps4 so idk if that has any effect on this issue, I have recently started a new ultimate team after not playing it this year, it is certain positions whenever I try to subs a player into my lineup it kicks me out, say for example I try to put in my highest overall right guard it will kick me out of ultimate team and say "ERROR our servers cannot process your request at this time. please try again later." and the easy solution to this would be just to generate best lineup but for those of you that play ultimate team you know there's cards that play multiple positions on offense and defense at once and it only subs them in for there main position when you generate best lineup.