Gday Metal.
Yeah we know about that problem mate. We could put up as a reminder "make sure your squad is unlocked". But as Evil.Clown said - those locked squads are (most of the time) a glitch.
The guys IN those squads usually arent locking it themselves, so unfortunately they probably wouldnt even pay attention to the messages.
Lets hope that it gets fixed sometime soon, but i wont hold my breath.
For all those other times - when its not a game glitch - players are still allowed to lock squads. It might be a pain in the ass - but its a part of the game and not something we want to alter.